Change of Height of Wireless Device

ABSTRACT

A method may include determining, by a wireless device not in a radio resource control (RRC) connected state, a change of height of the wireless device. The method may also include receiving, by the wireless device from the base station, at least one of a threshold for determining the change of height, a hysteresis value for determining the change of height, an event type associated with the change of height, and a parameter indicating that the threshold, the hysteresis value, and/or the event type is for height measurements by the wireless device while not in the RRC connected state. The method may further include transmitting, by the wireless device to a base station, a message indicating the change of height of the wireless device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is continuation of PCT/US22/17857 filed Feb. 25, 2022, which claims the benefit of U.S. Provisional Application No. 63/153,794, filed Feb. 25, 2021, each of which is hereby incorporated by reference in its entirety.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings.

FIG. 1A and FIG. 1B illustrate example communication networks including an access network and a core network.

FIG. 2A, FIG. 2B, FIG. 2C, and FIG. 2D illustrate various examples of a framework for a service-based architecture within a core network.

FIG. 3 illustrates an example communication network including core network functions.

FIG. 4A and FIG. 4B illustrate example of core network architecture with multiple user plane functions and untrusted access.

FIG. 5 illustrates an example of a core network architecture for a roaming scenario.

FIG. 6 illustrates an example of network slicing.

FIG. 7A, FIG. 7B, and FIG. 7C illustrate a user plane protocol stack, a control plane protocol stack, and services provided between protocol layers of the user plane protocol stack.

FIG. 8 illustrates an example of a quality of service model for data exchange.

FIG. 9A, FIG. 9B, FIG. 9C, and FIG. 9D illustrate example states and state transitions of a wireless device.

FIG. 10 illustrates an example of a registration procedure for a wireless device.

FIG. 11 illustrates an example of a service request procedure for a wireless device.

FIG. 12 illustrates an example of a protocol data unit session establishment procedure for a wireless device.

FIG. 13 illustrates examples of components of the elements in a communications network.

FIG. 14A, FIG. 14B, FIG. 14C, and FIG. 14D illustrate various examples of physical core network deployments, each having one or more network functions or portions thereof.

FIG. 15 illustrates a service-based architecture for a 5G network regarding interaction between a control plane (CP) and a user plane (UP).

FIG. 16 illustrates an example architecture of an unmanned aerial system (UAS) in accordance with embodiments of the present disclosure.

FIG. 17 illustrates an example scenario of how an unmanned aerial vehicle interacts with base stations regarding interference in accordance with embodiments of the present disclosure.

FIG. 18 illustrates an example architecture for an unmanned aerial system regarding interfaces in accordance with embodiments of the present disclosure.

FIG. 19 illustrates an example registration procedure regarding an authentication and authorization (AA) for a UAS service in accordance with embodiments of the present disclosure.

FIG. 20 illustrates example service specific authentication and authorization procedure in accordance with embodiments of the present disclosure.

FIG. 21 illustrates an example scenario in accordance with embodiments of the present disclosure that a height based event notification is used by third party service providers.

FIG. 22 illustrates an example height reporting scenario for the wireless device being above a threshold in accordance with embodiments of the present disclosure.

FIG. 23 illustrates an example height reporting scenario in accordance with embodiments of the present disclosure.

FIG. 24 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure.

FIG. 25 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure.

FIG. 26 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure.

FIG. 27 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure.

FIG. 28 illustrates an example height reporting scenario in accordance with embodiments of the present disclosure.

FIG. 29 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure.

FIG. 30 is an example flow chart as part of the example embodiments.

FIG. 31 is an example flow chart as part of the example embodiments.

DETAILED DESCRIPTION

In the present disclosure, various embodiments are presented as examples of how the disclosed techniques may be implemented and/or how the disclosed techniques may be practiced in environments and scenarios. It will be apparent to persons skilled in the relevant art that various changes in form and detail can be made therein without departing from the scope. In fact, after reading the description, it will be apparent to one skilled in the relevant art how to implement alternative embodiments. The present embodiments should not be limited by any of the described exemplary embodiments. The embodiments of the present disclosure will be described with reference to the accompanying drawings. Limitations, features, and/or elements from the disclosed example embodiments may be combined to create further embodiments within the scope of the disclosure. Any figures which highlight the functionality and advantages, are presented for example purposes only. The disclosed architecture is sufficiently flexible and configurable, such that it may be utilized in ways other than that shown. For example, the actions listed in any flowchart may be re-ordered or only optionally used in some embodiments.

Embodiments may be configured to operate as needed. The disclosed mechanism may be performed when certain criteria are met, for example, in a wireless device, a base station, a radio environment, a network, a combination of the above, and/or the like. Example criteria may be based, at least in part, on for example, wireless device or network node configurations, traffic load, initial system set up, packet sizes, traffic characteristics, a combination of the above, and/or the like. When the one or more criteria are met, various example embodiments may be applied. Therefore, it may be possible to implement example embodiments that selectively implement disclosed protocols.

A base station may communicate with a mix of wireless devices. Wireless devices and/or base stations may support multiple technologies, and/or multiple releases of the same technology. Wireless devices may have one or more specific capabilities. When this disclosure refers to a base station communicating with a plurality of wireless devices, this disclosure may refer to a subset of the total wireless devices in a coverage area. This disclosure may refer to, for example, a plurality of wireless devices of a given LTE or 5G release with a given capability and in a given sector of the base station. The plurality of wireless devices in this disclosure may refer to a selected plurality of wireless devices, and/or a subset of total wireless devices in a coverage area which perform according to disclosed methods, and/or the like. There may be a plurality of base stations or a plurality of wireless devices in a coverage area that may not comply with the disclosed methods, for example, those wireless devices or base stations may perform based on older releases of LTE or 5G technology.

In this disclosure, “a” and “an” and similar phrases refer to a single instance of a particular element, but should not be interpreted to exclude other instances of that element. For example, a bicycle with two wheels may be described as having “a wheel”. Any term that ends with the suffix “(s)” is to be interpreted as “at least one” and/or “one or more.” In this disclosure, the term “may” is to be interpreted as “may, for example.” In other words, the term “may” is indicative that the phrase following the term “may” is an example of one of a multitude of suitable possibilities that may, or may not, be employed by one or more of the various embodiments. The terms “comprises” and “consists of”, as used herein, enumerate one or more components of the element being described. The term “comprises” is interchangeable with “includes” and does not exclude unenumerated components from being included in the element being described. By contrast, “consists of” provides a complete enumeration of the one or more components of the element being described.

The phrases “based on”, “in response to”, “depending on”, “employing”, “using”, and similar phrases indicate the presence and/or influence of a particular factor and/or condition on an event and/or action, but do not exclude unenumerated factors and/or conditions from also being present and/or influencing the event and/or action. For example, if action X is performed “based on” condition Y, this is to be interpreted as the action being performed “based at least on” condition Y. For example, if the performance of action X is performed when conditions Y and Z are both satisfied, then the performance of action X may be described as being “based on Y”.

The term “configured” may relate to the capacity of a device whether the device is in an operational or non-operational state. Configured may refer to specific settings in a device that effect the operational characteristics of the device whether the device is in an operational or non-operational state. In other words, the hardware, software, firmware, registers, memory values, and/or the like may be “configured” within a device, whether the device is in an operational or nonoperational state, to provide the device with specific characteristics. Terms such as “a control message to cause in a device” may mean that a control message has parameters that may be used to configure specific characteristics or may be used to implement certain actions in the device, whether the device is in an operational or non-operational state.

In this disclosure, a parameter may comprise one or more information objects, and an information object may comprise one or more other objects. For example, if parameter J comprises parameter K, and parameter K comprises parameter L, and parameter L comprises parameter M, then J comprises L, and J comprises M. A parameter may be referred to as a field or information element. In an example embodiment, when one or more messages comprise a plurality of parameters, it implies that a parameter in the plurality of parameters is in at least one of the one or more messages, but does not have to be in each of the one or more messages.

This disclosure may refer to possible combinations of enumerated elements. For the sake of brevity and legibility, the present disclosure does not explicitly recite each and every permutation that may be obtained by choosing from a set of optional features. The present disclosure is to be interpreted as explicitly disclosing all such permutations. For example, the seven possible combinations of enumerated elements A, B, C consist of: (1) “A”; (2) “B”; (3) “C”; (4) “A and B”; (5) “A and C”; (6) “B and C”; and (7) “A, B, and C”. For the sake of brevity and legibility, these seven possible combinations may be described using any of the following interchangeable formulations: “at least one of A, B, and C”; “at least one of A, B, or C”; “one or more of A, B, and C”; “one or more of A, B, or C”; “A, B, and/or C”. It will be understood that impossible combinations are excluded. For example, “X and/or not-X” should be interpreted as “X or not-X”. It will be further understood that these formulations may describe alternative phrasings of overlapping and/or synonymous concepts, for example, “identifier, identification, and/or ID number”.

This disclosure may refer to sets and/or subsets. As an example, set X may be a set of elements comprising one or more elements. If every element of X is also an element of Y, then X may be referred to as a subset of Y. In this disclosure, only non-empty sets and subsets are considered. For example, if Y consists of the elements Y1, Y2, and Y3, then the possible subsets of Y are {Y1, Y2, Y3}, {Y1, Y2}, {Y1, Y3}, {Y2, Y3}, {Y1}, {Y2}, and {Y3}.

FIG. 1A illustrates an example of a communication network 100 in which embodiments of the present disclosure may be implemented. The communication network 100 may comprise, for example, a public land mobile network (PLMN) run by a network operator. As illustrated in FIG. 1A, the communication network 100 includes a wireless device 101, an access network (AN) 102, a core network (CN) 105, and one or more data network (DNs) 108.

The wireless device 101 may communicate with DNs 108 via AN 102 and CN 105. In the present disclosure, the term wireless device may refer to and encompass any mobile device or fixed (non-mobile) device for which wireless communication is needed or usable. For example, a wireless device may be a telephone, smart phone, tablet, computer, laptop, sensor, meter, wearable device, Internet of Things (IoT) device, vehicle road side unit (RSU), relay node, automobile, unmanned aerial vehicle, urban air mobility, and/or any combination thereof. The term wireless device encompasses other terminology, including user equipment (UE), user terminal (UT), access terminal (AT), mobile station, handset, wireless transmit and receive unit (WTRU), and/or wireless communication device.

The AN 102 may connect wireless device 101 to CN 105 in any suitable manner. The communication direction from the AN 102 to the wireless device 101 is known as the downlink and the communication direction from the wireless device 101 to AN 102 is known as the uplink. Downlink transmissions may be separated from uplink transmissions using frequency division duplexing (FDD), time-division duplexing (TDD), and/or some combination of the two duplexing techniques. The AN 102 may connect to wireless device 101 through radio communications over an air interface. An access network that at least partially operates over the air interface may be referred to as a radio access network (RAN). The CN 105 may set up one or more end-to-end connection between wireless device 101 and the one or more DNs 108. The CN 105 may authenticate wireless device 101 and provide charging functionality.

In the present disclosure, the term base station may refer to and encompass any element of AN 102 that facilitates communication between wireless device 101 and AN 102. Access networks and base stations have many different names and implementations. The base station may be a terrestrial base station fixed to the earth. The base station may be a mobile base station with a moving coverage area. The base station may be in space, for example, on board a satellite. For example, WiFi and other standards may use the term access point. As another example, the Third-Generation Partnership Project (3GPP) has produced specifications for three generations of mobile networks, each of which uses different terminology. Third Generation (3G) and/or Universal Mobile Telecommunications System (UMTS) standards may use the term Node B. 4G, Long Term Evolution (LTE), and/or Evolved Universal Terrestrial Radio Access (E-UTRA) standards may use the term Evolved Node B (eNB). 5G and/or New Radio (NR) standards may describe AN 102 as a next-generation radio access network (NG-RAN) and may refer to base stations as Next Generation eNB (ng-eNB) and/or Generation Node B (gNB). Future standards (for example, 6G, 7G, 8G) may use new terminology to refer to the elements which implement the methods described in the present disclosure (e.g., wireless devices, base stations, ANs, CNs, and/or components thereof). A base station may be implemented as a repeater or relay node used to extend the coverage area of a donor node. A repeater node may amplify and rebroadcast a radio signal received from a donor node. A relay node may perform the same/similar functions as a repeater node but may decode the radio signal received from the donor node to remove noise before amplifying and rebroadcasting the radio signal.

The AN 102 may include one or more base stations, each having one or more coverage areas. The geographical size and/or extent of a coverage area may be defined in terms of a range at which a receiver of AN 102 can successfully receive transmissions from a transmitter (e.g., wireless device 101) operating within the coverage area (and/or vice-versa). The coverage areas may be referred to as sectors or cells (although in some contexts, the term cell refers to the carrier frequency used in a particular coverage area, rather than the coverage area itself). Base stations with large coverage areas may be referred to as macrocell base stations. Other base stations cover smaller areas, for example, to provide coverage in areas with weak macrocell coverage, or to provide additional coverage in areas with high traffic (sometimes referred to as hotspots). Examples of small cell base stations include, in order of decreasing coverage area, microcell base stations, picocell base stations, and femtocell base stations or home base stations. Together, the coverage areas of the base stations may provide radio coverage to wireless device 101 over a wide geographic area to support wireless device mobility.

A base station may include one or more sets of antennas for communicating with the wireless device 101 over the air interface. Each set of antennas may be separately controlled by the base station. Each set of antennas may have a corresponding coverage area. As an example, a base station may include three sets of antennas to respectively control three coverage areas on three different sides of the base station. The entirety of the base station (and its corresponding antennas) may be deployed at a single location. Alternatively, a controller at a central location may control one or more sets of antennas at one or more distributed locations. The controller may be, for example, a baseband processing unit that is part of a centralized or cloud RAN architecture. The baseband processing unit may be either centralized in a pool of baseband processing units or virtualized. A set of antennas at a distributed location may be referred to as a remote radio head (RRH).

FIG. 1B illustrates another example communication network 150 in which embodiments of the present disclosure may be implemented. The communication network 150 may comprise, for example, a PLMN run by a network operator. As illustrated in FIG. 1B, communication network 150 includes UEs 151, a next generation radio access network (NG-RAN) 152, a 5G core network (5G-CN) 155, and one or more DNs 158. The NG-RAN 152 includes one or more base stations, illustrated as generation node Bs (gNBs) 152A and next generation evolved Node Bs (ng eNBs) 152B. The 5G-CN 155 includes one or more network functions (NFs), including control plane functions 155A and user plane functions 155B. The one or more DNs 158 may comprise public DNs (e.g., the Internet), private DNs, and/or intra-operator DNs. Relative to corresponding components illustrated in FIG. 1A, these components may represent specific implementations and/or terminology.

The base stations of the NG-RAN 152 may be connected to the UEs 151 via Uu interfaces. The base stations of the NG-RAN 152 may be connected to each other via Xn interfaces. The base stations of the NG-RAN 152 may be connected to 5G CN 155 via NG interfaces. The Uu interface may include an air interface. The NG and Xn interfaces may include an air interface, or may consist of direct physical connections and/or indirect connections over an underlying transport network (e.g., an internet protocol (IP) transport network).

Each of the Uu, Xn, and NG interfaces may be associated with a protocol stack. The protocol stacks may include a user plane (UP) and a control plane (CP). Generally, user plane data may include data pertaining to users of the UEs 151, for example, internet content downloaded via a web browser application, sensor data uploaded via a tracking application, or email data communicated to or from an email server. Control plane data, by contrast, may comprise signaling and messages that facilitate packaging and routing of user plane data so that it can be exchanged with the DN(s). The NG interface, for example, may be divided into an NG user plane interface (NG-U) and an NG control plane interface (NG-C). The NG-U interface may provide delivery of user plane data between the base stations and the one or more user plane network functions 155B. The NG-C interface may be used for control signaling between the base stations and the one or more control plane network functions 155A. The NG-C interface may provide, for example, NG interface management, UE context management, UE mobility management, transport of NAS messages, paging, PDU session management, and configuration transfer and/or warning message transmission. In some cases, the NG-C interface may support transmission of user data (for example, a small data transmission for an IoT device).

One or more of the base stations of the NG-RAN 152 may be split into a central unit (CU) and one or more distributed units (DUs). A CU may be coupled to one or more DUs via an F1 interface. The CU may handle one or more upper layers in the protocol stack and the DU may handle one or more lower layers in the protocol stack. For example, the CU may handle RRC, PDCP, and SDAP, and the DU may handle RLC, MAC, and PHY. The one or more DUs may be in geographically diverse locations relative to the CU and/or each other. Accordingly, the CU/DU split architecture may permit increased coverage and/or better coordination.

The gNBs 152A and ng-eNBs 152B may provide different user plane and control plane protocol termination towards the UEs 151. For example, the gNB 154A may provide new radio (NR) protocol terminations over a Uu interface associated with a first protocol stack. The ng-eNBs 152B may provide Evolved UMTS Terrestrial Radio Access (E-UTRA) protocol terminations over a Uu interface associated with a second protocol stack.

The 5G-CN 155 may authenticate UEs 151, set up end-to-end connections between UEs 151 and the one or more DNs 158, and provide charging functionality. The 5G-CN 155 may be based on a service-based architecture, in which the NFs making up the 5G-CN 155 offer services to each other and to other elements of the communication network 150 via interfaces. The 5G-CN 155 may include any number of other NFs and any number of instances of each NF.

FIG. 2A, FIG. 2B, FIG. 2C, and FIG. 2D illustrate various examples of a framework for a service-based architecture within a core network. In a service-based architecture, a service may be sought by a service consumer and provided by a service producer. Prior to obtaining a particular service, an NF may determine where such a service can be obtained. To discover a service, the NF may communicate with a network repository function (NRF). As an example, an NF that provides one or more services may register with a network repository function (NRF). The NRF may store data relating to the one or more services that the NF is prepared to provide to other NFs in the service-based architecture. A consumer NF may query the NRF to discover a producer NF (for example, by obtaining from the NRF a list of NF instances that provide a particular service).

In the example of FIG. 2A, an NF 211 (a consumer NF in this example) may send a request 221 to an NF 212 (a producer NF). The request 221 may be a request for a particular service and may be sent based on a discovery that NF 212 is a producer of that service. The request 221 may comprise data relating to NF 211 and/or the requested service. The NF 212 may receive request 221, perform one or more actions associated with the requested service (e.g., retrieving data), and provide a response 221. The one or more actions performed by the NF 212 may be based on request data included in the request 221, data stored by NF 212, and/or data retrieved by NF 212. The response 222 may notify NF 211 that the one or more actions have been completed. The response 222 may comprise response data relating to NF 212, the one or more actions, and/or the requested service.

In the example of FIG. 2B, an NF 231 sends a request 241 to an NF 232. In this example, part of the service produced by NF 232 is to send a request 242 to an NF 233. The NF 233 may perform one or more actions and provide a response 243 to NF 232. Based on response 243, NF 232 may send a response 244 to NF 231. It will be understood from FIG. 2B that a single NF may perform the role of producer of services, consumer of services, or both. A particular NF service may include any number of nested NF services produced by one or more other NFs.

FIG. 2C illustrates examples of subscribe-notify interactions between a consumer NF and a producer NF. In FIG. 2C, an NF 251 sends a subscription 261 to an NF 252. An NF 253 sends a subscription 262 to the NF 252. Two NFs are shown in FIG. 2C for illustrative purposes (to demonstrate that the NF 252 may provide multiple subscription services to different NFs), but it will be understood that a subscribe-notify interaction only requires one subscriber. The NFs 251, 253 may be independent from one another. For example, the NFs 251, 253 may independently discover NF 252 and/or independently determine to subscribe to the service offered by NF 252. In response to receipt of a subscription, the NF 252 may provide a notification to the subscribing NF. For example, NF 252 may send a notification 263 to NF 251 based on subscription 261 and may send a notification 264 to NF 253 based on subscription 262.

As shown in the example illustration of FIG. 2C, the sending of the notifications 263, 264 may be based on a determination that a condition has occurred. For example, the notifications 263, 264 may be based on a determination that a particular event has occurred, a determination that a particular condition is outstanding, and/or a determination that a duration of time associated with the subscription has elapsed (for example, a period associated with a subscription for periodic notifications). As shown in the example illustration of FIG. 2C, NF 252 may send notifications 263, 264 to NFs 251, 253 simultaneously and/or in response to the same condition. However, it will be understood that the NF 252 may provide notifications at different times and/or in response to different notification conditions. In an example, the NF 251 may request a notification when a certain parameter, as measured by the NF 252, exceeds a first threshold, and the NF 252 may request a notification when the parameter exceeds a second threshold different from the first threshold. In an example, a parameter of interest and/or a corresponding threshold may be indicated in the subscriptions 261, 262.

FIG. 2D illustrates another example of a subscribe-notify interaction. In FIG. 2D, an NF 271 sends a subscription 281 to an NF 272. In response to receipt of subscription 281 and/or a determination that a notification condition has occurred, NF 272 may send a notification 284. The notification 284 may be sent to an NF 273. Unlike the example in FIG. 2C (in which a notification is sent to the subscribing NF), FIG. 2D demonstrates that a subscription and its corresponding notification may be associated with different NFs. For example, NF 271 may subscribe to the service provided by NF 272 on behalf of NF 273.

FIG. 3 illustrates another example communication network 300 in which embodiments of the present disclosure may be implemented. Communication network 300 includes a user equipment (UE) 301, an access network (AN) 302, and a data network (DN) 308. The remaining elements depicted in FIG. 3 may be included in and/or associated with a core network. Each element of the core network may be referred to as a network function (NF).

The NFs depicted in FIG. 3 include a user plane function (UPF) 305, an access and mobility management function (AMF) 312, a session management function (SMF) 314, a policy control function (PCF) 320, a network repository function (NRF) 330, a network exposure function (NEF) 340, a unified data management (UDM) 350, an authentication server function (AUSF) 360, a network slice selection function (NSSF) 370, a charging function (CHF) 380, a network data analytics function (NWDAF) 390, and an application function (AF) 399. The UPF 305 may be a user-plane core network function, whereas the NFs 312, 314, and 320-390 may be control-plane core network functions. Although not shown in the example of FIG. 3 , the core network may include additional instances of any of the NFs depicted and/or one or more different NF types that provide different services. Other examples of NF type include a gateway mobile location center (GMLC), a location management function (LMF), an operations, administration, and maintenance function (OAM), a public warning system (PWS), a short message service function (SMSF), a unified data repository (UDR), and an unstructured data storage function (UDSF).

Each element depicted in FIG. 3 has an interface with at least one other element. The interface may be a logical connection rather than, for example, a direct physical connection. Any interface may be identified using a reference point representation and/or a service-based representation. In a reference point representation, the letter ‘N’ is followed by a numeral, indicating an interface between two specific elements. For example, as shown in FIG. 3 , AN 302 and UPF 305 interface via ‘N3’, whereas UPF 305 and DN 308 interface via ‘N6’. By contrast, in a service-based representation, the letter ‘N’ is followed by letters. The letters identify an NF that provides services to the core network. For example, PCF 320 may provide services via interface ‘Npcf’. The PCF 320 may provide services to any NF in the core network via ‘Npcf’. Accordingly, a service-based representation may correspond to a bundle of reference point representations. For example, the Npcf interface between PCF 320 and the core network generally may correspond to an N7 interface between PCF 320 and SMF 314, an N30 interface between PCF 320 and NEF 340, etc.

The UPF 305 may serve as a gateway for user plane traffic between AN 302 and DN 308. The UE 301 may connect to UPF 305 via a Uu interface and an N3 interface (also described as NG-U interface). The UPF 305 may connect to DN 308 via an N6 interface. The UPF 305 may connect to one or more other UPFs (not shown) via an N9 interface. The UE 301 may be configured to receive services through a protocol data unit (PDU) session, which is a logical connection between UE 301 and DN 308. The UPF 305 (or a plurality of UPFs if desired) may be selected by SMF 314 to handle a particular PDU session between UE 301 and DN 308. The SMF 314 may control the functions of UPF 305 with respect to the PDU session. The SMF 314 may connect to UPF 305 via an N4 interface. The UPF 305 may handle any number of PDU sessions associated with any number of UEs (via any number of ANs). For purposes of handling the one or more PDU sessions, UPF 305 may be controlled by any number of SMFs via any number of corresponding N4 interfaces.

The AMF 312 depicted in FIG. 3 may control UE access to the core network. The UE 301 may register with the network via AMF 312. It may be necessary for UE 301 to register prior to establishing a PDU session. The AMF 312 may manage a registration area of UE 301, enabling the network to track the physical location of UE 301 within the network. For a UE in connected mode, AMF 312 may manage UE mobility, for example, handovers from one AN or portion thereof to another. For a UE in idle mode, AMF 312 may perform registration updates and/or page the UE to transition the UE to connected mode.

The AMF 312 may receive, from UE 301, non-access stratum (NAS) messages transmitted in accordance with NAS protocol. NAS messages relate to communications between UE 301 and the core network. Although NAS messages may be relayed to AMF 312 via AN 302, they may be described as communications via the N1 interface. NAS messages may facilitate UE registration and mobility management, for example, by authenticating, identifying, configuring, and/or managing a connection of UE 301. NAS messages may support session management procedures for maintaining user plane connectivity and quality of service (QoS) of a session between UE 301 and DN 309. If the NAS message involves session management, AMF 312 may send the NAS message to SMF 314. NAS messages may be used to transport messages between UE 301 and other components of the core network (e.g., core network components other than AMF 312 and SMF 314). The AMF 312 may act on a particular NAS message itself, or alternatively, forward the NAS message to an appropriate core network function (e.g., SMF 314, etc.)

The SMF 314 depicted in FIG. 3 may establish, modify, and/or release a PDU session based on messaging received UE 301. The SMF 314 may allocate, manage, and/or assign an IP address to UE 301, for example, upon establishment of a PDU session. There may be multiple SMFs in the network, each of which may be associated with a respective group of wireless devices, base stations, and/or UPFs. A UE with multiple PDU sessions may be associated with a different SMF for each PDU session. As noted above, SMF 314 may select one or more UPFs to handle a PDU session and may control the handling of the PDU session by the selected UPF by providing rules for packet handling (PDR, FAR, QER, etc.). Rules relating to QoS and/or charging for a particular PDU session may be obtained from PCF 320 and provided to UPF 305.

The PCF 320 may provide, to other NFs, services relating to policy rules. The PCF 320 may use subscription data and information about network conditions to determine policy rules and then provide the policy rules to a particular NF which may be responsible for enforcement of those rules. Policy rules may relate to policy control for access and mobility, and may be enforced by the AMF. Policy rules may relate to session management, and may be enforced by the SMF 314. Policy rules may be, for example, network-specific, wireless device-specific, session-specific, or data flow-specific.

The NRF 330 may provide service discovery. The NRF 330 may belong to a particular PLMN. The NRF 330 may maintain NF profiles relating to other NFs in the communication network 300. The NF profile may include, for example, an address, PLMN, and/or type of the NF, a slice identifier, a list of the one or more services provided by the NF, and the authorization required to access the services.

The NEF 340 depicted in FIG. 3 may provide an interface to external domains, permitting external domains to selectively access the control plane of the communication network 300. The external domain may comprise, for example, third-party network functions, application functions, etc. The NEF 340 may act as a proxy between external elements and network functions such as AMF 312, SMF 314, PCF 320, UDM 350, etc. As an example, NEF 340 may determine a location or reachability status of UE 301 based on reports from AMF 312, and provide status information to an external element. As an example, an external element may provide, via NEF 340, information that facilitates the setting of parameters for establishment of a PDU session. The NEF 340 may determine which data and capabilities of the control plane are exposed to the external domain. The NEF 340 may provide secure exposure that authenticates and/or authorizes an external entity to which data or capabilities of the communication network 300 are exposed. The NEF 340 may selectively control the exposure such that the internal architecture of the core network is hidden from the external domain.

The UDM 350 may provide data storage for other NFs. The UDM 350 may permit a consolidated view of network information that may be used to ensure that the most relevant information can be made available to different NFs from a single resource. The UDM 350 may store and/or retrieve information from a unified data repository (UDR). For example, UDM 350 may obtain user subscription data relating to UE 301 from the UDR.

The AUSF 360 may support mutual authentication of UE 301 by the core network and authentication of the core network by UE 301. The AUSF 360 may perform key agreement procedures and provide keying material that can be used to improve security.

The NSSF 370 may select one or more network slices to be used by the UE 301. The NSSF 370 may select a slice based on slice selection information. For example, the NSSF 370 may receive Single Network Slice Selection Assistance Information (S-NSSAI) and map the S-NSSAI to a network slice instance identifier (NSI).

The CHF 380 may control billing-related tasks associated with UE 301. For example, UPF 305 may report traffic usage associated with UE 301 to SMF 314. The SMF 314 may collect usage data from UPF 305 and one or more other UPFs. The usage data may indicate how much data is exchanged, what DN the data is exchanged with, a network slice associated with the data, or any other information that may influence billing. The SMF 314 may share the collected usage data with the CHF. The CHF may use the collected usage data to perform billing-related tasks associated with UE 301. The CHF may, depending on the billing status of UE 301, instruct SMF 314 to limit or influence access of UE 301 and/or to provide billing-related notifications to UE 301.

The NWDAF 390 may collect and analyze data from other network functions and offer data analysis services to other network functions. As an example, NWDAF 390 may collect data relating to a load level for a particular network slice instance from UPF 305, AMF 312, and/or SMF 314. Based on the collected data, NWDAF 390 may provide load level data to the PCF 320 and/or NSSF 370, and/or notify the PC 220 and/or NSSF 370 if load level for a slice reaches and/or exceeds a load level threshold.

The AF 399 may be outside the core network, but may interact with the core network to provide information relating to the QoS requirements or traffic routing preferences associated with a particular application. The AF 399 may access the core network based on the exposure constraints imposed by the NEF 340. However, an operator of the core network may consider the AF 399 to be a trusted domain that can access the network directly.

FIGS. 4A, 4B, and 5 illustrate other examples of core network architectures that are analogous in some respects to the core network architecture 300 depicted in FIG. 3 . For conciseness, some of the core network elements depicted in FIG. 3 are omitted. Many of the elements depicted in FIGS. 4A, 4B, and 5 are analogous in some respects to elements depicted in FIG. 3 . For conciseness, some of the details relating to their functions or operation are omitted.

FIG. 4A illustrates an example of a core network architecture 400A comprising an arrangement of multiple UPFs. Core network architecture 400A includes a UE 401, an AN 402, an AMF 412, and an SMF 414. Unlike previous examples of core network architectures described above, FIG. 4A depicts multiple UPFs, including a UPF 405, a UPF 406, and a UPF 407, and multiple DNs, including a DN 408 and a DN 409. Each of the multiple UPFs 405, 406, 407 may communicate with the SMF 414 via an N4 interface. The DNs 408, 409 communicate with the UPFs 405, 406, respectively, via N6 interfaces. As shown in FIG. 4A, the multiple UPFs 405, 406, 407 may communicate with one another via N9 interfaces.

The UPFs 405, 406, 407 may perform traffic detection, in which the UPFs identify and/or classify packets. Packet identification may be performed based on packet detection rules (PDR) provided by the SMF 414. A PDR may include packet detection information comprising one or more of: a source interface, a UE IP address, core network (CN) tunnel information (e.g., a CN address of an N3/N9 tunnel corresponding to a PDU session), a network instance identifier, a quality of service flow identifier (QFI), a filter set (for example, an IP packet filter set or an ethernet packet filter set), and/or an application identifier.

In addition to indicating how a particular packet is to be detected, a PDR may further indicate rules for handling the packet upon detection thereof. The rules may include, for example, forwarding action rules (FARs), multi-access rules (MARs), usage reporting rules (URRs), QoS enforcement rules (QERs), etc. For example, the PDR may comprise one or more FAR identifiers, MAR identifiers, URR identifiers, and/or QER identifiers. These identifiers may indicate the rules that are prescribed for the handling of a particular detected packet.

The UPF 405 may perform traffic forwarding in accordance with a FAR. For example, the FAR may indicate that a packet associated with a particular PDR is to be forwarded, duplicated, dropped, and/or buffered. The FAR may indicate a destination interface, for example, “access” for downlink or “core” for uplink. If a packet is to be buffered, the FAR may indicate a buffering action rule (BAR). As an example, UPF 405 may perform data buffering of a certain number of downlink packets if a PDU session is deactivated.

The UPF 405 may perform QoS enforcement in accordance with a QER. For example, the QER may indicate a guaranteed bitrate that is authorized and/or a maximum bitrate to be enforced for a packet associated with a particular PDR. The QER may indicate that a particular guaranteed and/or maximum bitrate may be for uplink packets and/or downlink packets. The UPF 405 may mark packets belonging to a particular QoS flow with a corresponding QFI. The marking may enable a recipient of the packet to determine a QoS of the packet.

The UPF 405 may provide usage reports to the SMF 414 in accordance with a URR. The URR may indicate one or more triggering conditions for generation and reporting of the usage report, for example, immediate reporting, periodic reporting, a threshold for incoming uplink traffic, or any other suitable triggering condition. The URR may indicate a method for measuring usage of network resources, for example, data volume, duration, and/or event.

As noted above, the DNs 408, 409 may comprise public DNs (e.g., the Internet), private DNs (e.g., private, internal corporate-owned DNs), and/or intra-operator DNs. Each DN may provide an operator service and/or a third-party service. The service provided by a DN may be the Internet, an IP multimedia subsystem (IMS), an augmented or virtual reality network, an edge computing or mobile edge computing (MEC) network, etc. Each DN may be identified using a data network name (DNN). The UE 401 may be configured to establish a first logical connection with DN 408 (a first PDU session), a second logical connection with DN 409 (a second PDU session), or both simultaneously (first and second PDU sessions).

Each PDU session may be associated with at least one UPF configured to operate as a PDU session anchor (PSA, or “anchor”). The anchor may be a UPF that provides an N6 interface with a DN.

In the example of FIG. 4A, UPF 405 may be the anchor for the first PDU session between UE 401 and DN 408, whereas the UPF 406 may be the anchor for the second PDU session between UE 401 and DN 409. The core network may use the anchor to provide service continuity of a particular PDU session (for example, IP address continuity) as UE 401 moves from one access network to another. For example, suppose that UE 401 establishes a PDU session using a data path to the DN 408 using an access network other than AN 402. The data path may include UPF 405 acting as anchor. Suppose further that the UE 401 later moves into the coverage area of the AN 402. In such a scenario, SMF 414 may select a new UPF (UPF 407) to bridge the gap between the newly entered access network (AN 402) and the anchor UPF (UPF 405). The continuity of the PDU session may be preserved as any number of UPFs are added or removed from the data path. When a UPF is added to a data path, as shown in FIG. 4A, it may be described as an intermediate UPF and/or a cascaded UPF.

As noted above, UPF 406 may be the anchor for the second PDU session between UE 401 and DN 409. Although the anchor for the first and second PDU sessions are associated with different UPFs in FIG. 4A, it will be understood that this is merely an example. It will also be understood that multiple PDU sessions with a single DN may correspond to any number of anchors. When there are multiple UPFs, a UPF at the branching point (UPF 407 in FIG. 4A) may operate as an uplink classifier (UL-CL). The UL-CL may divert uplink user plane traffic to different UPFs.

The SMF 414 may allocate, manage, and/or assign an IP address to UE 401, for example, upon establishment of a PDU session. The SMF 414 may maintain an internal pool of IP addresses to be assigned. The SMF 414 may, if necessary, assign an IP address provided by a dynamic host configuration protocol (DHCP) server or an authentication, authorization, and accounting (AAA) server. IP address management may be performed in accordance with a session and service continuity (SSC) mode. In SSC mode 1, an IP address of UE 401 may be maintained (and the same anchor UPF may be used) as the wireless device moves within the network. In SSC mode 2, the IP address of UE 401 changes as UE 401 moves within the network (e.g., the old IP address and UPF may be abandoned and a new IP address and anchor UPF may be established). In SSC mode 3, it may be possible to maintain an old IP address (similar to SSC mode 1) temporarily while establishing a new IP address (similar to SSC mode 2), thus combining features of SSC modes 1 and 2. Applications that are sensitive to IP address changes may operate in accordance with SSC mode 1.

UPF selection may be controlled by SMF 414. For example, upon establishment and/or modification of a PDU session between UE 401 and DN 408, SMF 414 may select UPF 405 as the anchor for the PDU session and/or UPF 407 as an intermediate UPF. Criteria for UPF selection include path efficiency and/or speed between AN 402 and DN 408. The reliability, load status, location, slice support and/or other capabilities of candidate UPFs may also be considered.

FIG. 4B illustrates an example of a core network architecture 400B that accommodates untrusted access. Similar to FIG. 4A, UE 401 as depicted in FIG. 4B connects to DN 408 via AN 402 and UPF 405. The AN 402 and UPF 405 constitute trusted (e.g., 3GPP) access to the DN 408. By contrast, UE 401 may also access DN 408 using an untrusted access network, AN 403, and a non-3GPP interworking function (N3IWF) 404.

The AN 403 may be, for example, a wireless land area network (WLAN) operating in accordance with the IEEE 802.11 standard. The UE 401 may connect to AN 403, via an interface Y1, in whatever manner is prescribed for AN 403. The connection to AN 403 may or may not involve authentication. The UE 401 may obtain an IP address from AN 403. The UE 401 may determine to connect to core network 400B and select untrusted access for that purpose. The AN 403 may communicate with N3IWF 404 via a Y2 interface. After selecting untrusted access, the UE 401 may provide N3IWF 404 with sufficient information to select an AMF. The selected AMF may be, for example, the same AMF that is used by UE 401 for 3GPP access (AMF 412 in the present example). The N3IWF 404 may communicate with AMF 412 via an N2 interface. The UPF 405 may be selected and N3IWF 404 may communicate with UPF 405 via an N3 interface. The UPF 405 may be a PDU session anchor (PSA) and may remain the anchor for the PDU session even as UE 401 shifts between trusted access and untrusted access.

FIG. 5 illustrates an example of a core network architecture 500 in which a UE 501 is in a roaming scenario. In a roaming scenario, UE 501 is a subscriber of a first PLMN (a home PLMN, or HPLMN) but attaches to a second PLMN (a visited PLMN, or VPLMN). Core network architecture 500 includes UE 501, an AN 502, a UPF 505, and a DN 508. The AN 502 and UPF 505 may be associated with a VPLMN. The VPLMN may manage the AN 502 and UPF 505 using core network elements associated with the VPLMN, including an AMF 512, an SMF 514, a PCF 520, an NRF 530, an NEF 540, and an NSSF 570. An AF 599 may be adjacent the core network of the VPLMN.

The UE 501 may not be a subscriber of the VPLMN. The AMF 512 may authorize UE 501 to access the network based on, for example, roaming restrictions that apply to UE 501. In order to obtain network services provided by the VPLMN, it may be necessary for the core network of the VPLMN to interact with core network elements of a HPLMN of UE 501, in particular, a PCF 521, an NRF 531, an NEF 541, a UDM 551, and/or an AUSF 561. The VPLMN and HPLMN may communicate using an N32 interface connecting respective security edge protection proxies (SEPPs). In FIG. 5 , the respective SEPPs are depicted as a VSEPP 590 and an HSEPP 591.

The VSEPP 590 and the HSEPP 591 communicate via an N32 interface for defined purposes while concealing information about each PLMN from the other. The SEPPs may apply roaming policies based on communications via the N32 interface. The PCF 520 and PCF 521 may communicate via the SEPPs to exchange policy-related signaling. The NRF 530 and NRF 531 may communicate via the SEPPs to enable service discovery of NFs in the respective PLMNs. The VPLMN and HPLMN may independently maintain NEF 540 and NEF 541. The NSSF 570 and NSSF 571 may communicate via the SEPPs to coordinate slice selection for UE 501. The HPLMN may handle all authentication and subscription related signaling. For example, when the UE 501 registers or requests service via the VPLMN, the VPLMN may authenticate UE 501 and/or obtain subscription data of UE 501 by accessing, via the SEPPs, the UDM 551 and AUSF 561 of the HPLMN.

The core network architecture 500 depicted in FIG. 5 may be referred to as a local breakout configuration, in which UE 501 accesses DN 508 using one or more UPFs of the VPLMN (i.e., UPF 505). However, other configurations are possible. For example, in a home-routed configuration (not shown in FIG. 5 ), UE 501 may access a DN using one or more UPFs of the HPLMN. In the home-routed configuration, an N9 interface may run parallel to the N32 interface, crossing the frontier between the VPLMN and the HPLMN to carry user plane data. One or more SMFs of the respective PLMNs may communicate via the N32 interface to coordinate session management for UE 501. The SMFs may control their respective UPFs on either side of the frontier.

FIG. 6 illustrates an example of network slicing. Network slicing may refer to division of shared infrastructure (e.g., physical infrastructure) into distinct logical networks. These distinct logical networks may be independently controlled, isolated from one another, and/or associated with dedicated resources.

Network architecture 600A illustrates an un-sliced physical network corresponding to a single logical network. The network architecture 600A comprises a user plane wherein UEs 601A, 601B, 601C (collectively, UEs 601) have a physical and logical connection to a DN 608 via an AN 602 and a UPF 605. The network architecture 600A comprises a control plane wherein an AMF 612 and a SMF 614 control various aspects of the user plane.

The network architecture 600A may have a specific set of characteristics (e.g., relating to maximum bit rate, reliability, latency, bandwidth usage, power consumption, etc.). This set of characteristics may be affected by the nature of the network elements themselves (e.g., processing power, availability of free memory, proximity to other network elements, etc.) or the management thereof (e.g., optimized to maximize bit rate or reliability, reduce latency or power bandwidth usage, etc.). The characteristics of network architecture 600A may change over time, for example, by upgrading equipment or by modifying procedures to target a particular characteristic. However, at any given time, network architecture 600A will have a single set of characteristics that may or may not be optimized for a particular use case. For example, UEs 601A, 601B, 601C may have different requirements, but network architecture 600A can only be optimized for one of the three.

Network architecture 600B is an example of a sliced physical network divided into multiple logical networks. In FIG. 6 , the physical network is divided into three logical networks, referred to as slice A, slice B, and slice C. For example, UE 601A may be served by AN 602A, UPF 605A, AMF 612, and SMF 614A. UE 601B may be served by AN 602B, UPF 605B, AMF 612, and SMF 614B. UE 601C may be served by AN 602C, UPF 605C, AMF 612, and SMF 614C. Although the respective UEs 601 communicate with different network elements from a logical perspective, these network elements may be deployed by a network operator using the same physical network elements.

Each network slice may be tailored to network services having different sets of characteristics. For example, slice A may correspond to enhanced mobile broadband (eMBB) service. Mobile broadband may refer to internet access by mobile users, commonly associated with smartphones. Slice B may correspond to ultra-reliable low-latency communication (URLLC), which focuses on reliability and speed. Relative to eMBB, URLLC may improve the feasibility of use cases such as autonomous driving and telesurgery. Slice C may correspond to massive machine type communication (mMTC), which focuses on low-power services delivered to a large number of users. For example, slice C may be optimized for a dense network of battery-powered sensors that provide small amounts of data at regular intervals. Many mMTC use cases would be prohibitively expensive if they operated using an eMBB or URLLC network.

If the service requirements for one of the UEs 601 changes, then the network slice serving that UE can be updated to provide better service. Moreover, the set of network characteristics corresponding to eMBB, URLLC, and mMTC may be varied, such that differentiated species of eMBB, URLLC, and mMTC are provided. Alternatively, network operators may provide entirely new services in response to, for example, customer demand.

In FIG. 6 , each of the UEs 601 has its own network slice. However, it will be understood that a single slice may serve any number of UEs and a single UE may operate using any number of slices. Moreover, in the example network architecture 600B, the AN 602, UPF 605 and SMF 614 are separated into three separate slices, whereas the AMF 612 is unsliced. However, it will be understood that a network operator may deploy any architecture that selectively utilizes any mix of sliced and unsliced network elements, with different network elements divided into different numbers of slices. Although FIG. 6 only depicts three core network functions, it will be understood that other core network functions may be sliced as well. A PLMN that supports multiple network slices may maintain a separate network repository function (NFR) for each slice, enabling other NFs to discover network services associated with that slice.

Network slice selection may be controlled by an AMF, or alternatively, by a separate network slice selection function (NSSF). For example, a network operator may define and implement distinct network slice instances (NSIs). Each NSI may be associated with single network slice selection assistance information (S-NSSAI). The S-NSSAI may include a particular slice/service type (SST) indicator (indicating eMBB, URLLC, mMTC, etc.). As an example, a particular tracking area may be associated with one or more configured S-NSSAIs. UEs may identify one or more requested and/or subscribed S-NSSAIs (e.g., during registration). The network may indicate to the UE one or more allowed and/or rejected S-NSSAIs.

The S-NSSAI may further include a slice differentiator (SD) to distinguish between different tenants of a particular slice and/or service type. For example, a tenant may be a customer (e.g., vehicle manufacture, service provider, etc.) of a network operator that obtains (for example, purchases) guaranteed network resources and/or specific policies for handling its subscribers. The network operator may configure different slices and/or slice types, and use the SD to determine which tenant is associated with a particular slice.

FIG. 7A, FIG. 7B, and FIG. 7C illustrate a user plane (UP) protocol stack, a control plane (CP) protocol stack, and services provided between protocol layers of the UP protocol stack.

The layers may be associated with an open system interconnection (OSI) model of computer networking functionality. In the OSI model, layer 1 may correspond to the bottom layer, with higher layers on top of the bottom layer. Layer 1 may correspond to a physical layer, which is concerned with the physical infrastructure used for transfer of signals (for example, cables, fiber optics, and/or radio frequency transceivers). In New Radio (NR), layer 1 may comprise a physical layer (PHY). Layer 2 may correspond to a data link layer. Layer 2 may be concerned with packaging of data (into, e.g., data frames) for transfer, between nodes of the network, using the physical infrastructure of layer 1. In NR, layer 2 may comprise a media access control layer (MAC), a radio link control layer (RLC), a packet data convergence layer (PDCP), and a service data application protocol layer (SDAP).

Layer 3 may correspond to a network layer. Layer 3 may be concerned with routing of the data which has been packaged in layer 2. Layer 3 may handle prioritization of data and traffic avoidance. In NR, layer 3 may comprise a radio resource control layer (RRC) and a non-access stratum layer (NAS). Layers 4 through 7 may correspond to a transport layer, a session layer, a presentation layer, and an application layer. The application layer interacts with an end user to provide data associated with an application. In an example, an end user implementing the application may generate data associated with the application and initiate sending of that information to a targeted data network (e.g., the Internet, an application server, etc.). Starting at the application layer, each layer in the OSI model may manipulate and/or repackage the information and deliver it to a lower layer. At the lowest layer, the manipulated and/or repackaged information may be exchanged via physical infrastructure (for example, electrically, optically, and/or electromagnetically). As it approaches the targeted data network, the information will be unpackaged and provided to higher and higher layers, until it once again reaches the application layer in a form that is usable by the targeted data network (e.g., the same form in which it was provided by the end user). To respond to the end user, the data network may perform this procedure in reverse.

FIG. 7A illustrates a user plane protocol stack. The user plane protocol stack may be a new radio (NR) protocol stack for a Uu interface between a UE 701 and a gNB 702. In layer 1 of the UP protocol stack, the UE 701 may implement PHY 731 and the gNB 702 may implement PHY 732. In layer 2 of the UP protocol stack, the UE 701 may implement MAC 741, RLC 751, PDCP 761, and SDAP 771. The gNB 702 may implement MAC 742, RLC 752, PDCP 762, and SDAP 772.

FIG. 7B illustrates a control plane protocol stack. The control plane protocol stack may be an NR protocol stack for the Uu interface between the UE 701 and the gNB 702 and/or an N1 interface between the UE 701 and an AMF 712. In layer 1 of the CP protocol stack, the UE 701 may implement PHY 731 and the gNB 702 may implement PHY 732. In layer 2 of the CP protocol stack, the UE 701 may implement MAC 741, RLC 751, PDCP 761, RRC 781, and NAS 791. The gNB 702 may implement MAC 742, RLC 752, PDCP 762, and RRC 782. The AMF 712 may implement NAS 792.

The NAS may be concerned with the non-access stratum, in particular, communication between the UE 701 and the core network (e.g., the AMF 712). Lower layers may be concerned with the access stratum, for example, communication between the UE 701 and the gNB 702. Messages sent between the UE 701 and the core network may be referred to as NAS messages. In an example, a NAS message may be relayed by the gNB 702, but the content of the NAS message (e.g., information elements of the NAS message) may not be visible to the gNB 702.

FIG. 7C illustrates an example of services provided between protocol layers of the NR user plane protocol stack illustrated in FIG. 7A. The UE 701 may receive services through a PDU session, which may be a logical connection between the UE 701 and a data network (DN). The UE 701 and the DN may exchange data packets associated with the PDU session. The PDU session may comprise one or more quality of service (QoS) flows. SDAP 771 and SDAP 772 may perform mapping and/or demapping between the one or more QoS flows of the PDU session and one or more radio bearers (e.g., data radio bearers). The mapping between the QoS flows and the data radio bearers may be determined in the SDAP 772 by the gNB 702, and the UE 701 may be notified of the mapping (e.g., based on control signaling and/or reflective mapping). For reflective mapping, the SDAP 772 of the gNB 220 may mark downlink packets with a QoS flow indicator (QFI) and deliver the downlink packets to the UE 701. The UE 701 may determine the mapping based on the QFI of the downlink packets.

PDCP 761 and PDCP 762 may perform header compression and/or decompression. Header compression may reduce the amount of data transmitted over the physical layer. The PDCP 761 and PDCP 762 may perform ciphering and/or deciphering. Ciphering may reduce unauthorized decoding of data transmitted over the physical layer (e.g., intercepted on an air interface), and protect data integrity (e.g., to ensure control messages originate from intended sources). The PDCP 761 and PDCP 762 may perform retransmissions of undelivered packets, in-sequence delivery and reordering of packets, duplication of packets, and/or identification and removal of duplicate packets. In a dual connectivity scenario, PDCP 761 and PDCP 762 may perform mapping between a split radio bearer and RLC channels.

RLC 751 and RLC 752 may perform segmentation, retransmission through Automatic Repeat Request (ARQ). The RLC 751 and RLC 752 may perform removal of duplicate data units received from MAC 741 and MAC 742, respectively. The RLCs 213 and 223 may provide RLC channels as a service to PDCPs 214 and 224, respectively.

MAC 741 and MAC 742 may perform multiplexing and/or demultiplexing of logical channels. MAC 741 and MAC 742 may map logical channels to transport channels. In an example, UE 701 may, in MAC 741, multiplex data units of one or more logical channels into a transport block. The UE 701 may transmit the transport block to the gNB 702 using PHY 731. The gNB 702 may receive the transport block using PHY 732 and demultiplex data units of the transport blocks back into logical channels. MAC 741 and MAC 742 may perform error correction through Hybrid Automatic Repeat Request (HARQ), logical channel prioritization, and/or padding.

PHY 731 and PHY 732 may perform mapping of transport channels to physical channels. PHY 731 and PHY 732 may perform digital and analog signal processing functions (e.g., coding/decoding and modulation/demodulation) for sending and receiving information (e.g., transmission via an air interface). PHY 731 and PHY 732 may perform multi-antenna mapping.

FIG. 8 illustrates an example of a quality of service (QoS) model for differentiated data exchange. In the QoS model of FIG. 8 , there are a UE 801, a AN 802, and a UPF 805. The QoS model facilitates prioritization of certain packet or protocol data units (PDUs), also referred to as packets. For example, higher-priority packets may be exchanged faster and/or more reliably than lower-priority packets. The network may devote more resources to exchange of high-QoS packets.

In the example of FIG. 8 , a PDU session 810 is established between UE 801 and UPF 805. The PDU session 810 may be a logical connection enabling the UE 801 to exchange data with a particular data network (for example, the Internet). The UE 801 may request establishment of the PDU session 810. At the time that the PDU session 810 is established, the UE 801 may, for example, identify the targeted data network based on its data network name (DNN). The PDU session 810 may be managed, for example, by a session management function (SMF, not shown). In order to facilitate exchange of data associated with the PDU session 810, between the UE 801 and the data network, the SMF may select the UPF 805 (and optionally, one or more other UPFs, not shown).

One or more applications associated with UE 801 may generate uplink packets 812A-812E associated with the PDU session 810. In order to work within the QoS model, UE 801 may apply QoS rules 814 to uplink packets 812A-812E. The QoS rules 814 may be associated with PDU session 810 and may be determined and/or provided to the UE 801 when PDU session 810 is established and/or modified. Based on QoS rules 814, UE 801 may classify uplink packets 812A-812E, map each of the uplink packets 812A-812E to a QoS flow, and/or mark uplink packets 812A-812E with a QoS flow indicator (QFI). As a packet travels through the network, and potentially mixes with other packets from other UEs having potentially different priorities, the QFI indicates how the packet should be handled in accordance with the QoS model. In the present illustration, uplink packets 812A, 812B are mapped to QoS flow 816A, uplink packet 812C is mapped to QoS flow 816B, and the remaining packets are mapped to QoS flow 816C.

The QoS flows may be the finest granularity of QoS differentiation in a PDU session. In the figure, three QoS flows 816A-816C are illustrated. However, it will be understood that there may be any number of QoS flows. Some QoS flows may be associated with a guaranteed bit rate (GBR QoS flows) and others may have bit rates that are not guaranteed (non-GBR QoS flows). QoS flows may also be subject to per-UE and per-session aggregate bit rates. One of the QoS flows may be a default QoS flow. The QoS flows may have different priorities. For example, QoS flow 816A may have a higher priority than QoS flow 816B, which may have a higher priority than QoS flow 816C. Different priorities may be reflected by different QoS flow characteristics. For example, QoS flows may be associated with flow bit rates. A particular QoS flow may be associated with a guaranteed flow bit rate (GFBR) and/or a maximum flow bit rate (MFBR). QoS flows may be associated with specific packet delay budgets (PDBs), packet error rates (PERs), and/or maximum packet loss rates. QoS flows may also be subject to per-UE and per-session aggregate bit rates.

In order to work within the QoS model, UE 801 may apply resource mapping rules 818 to the QoS flows 816A-816C. The air interface between UE 801 and AN 802 may be associated with resources 820. In the present illustration, QoS flow 816A is mapped to resource 820A, whereas QoS flows 816B, 816C are mapped to resource 820B. The resource mapping rules 818 may be provided by the AN 802. In order to meet QoS requirements, the resource mapping rules 818 may designate more resources for relatively high-priority QoS flows. With more resources, a high-priority QoS flow such as QoS flow 816A may be more likely to obtain the high flow bit rate, low packet delay budget, or other characteristic associated with QoS rules 814. The resources 820 may comprise, for example, radio bearers. The radio bearers (e.g., data radio bearers) may be established between the UE 801 and the AN 802. The radio bearers in 5G, between the UE 801 and the AN 802, may be distinct from bearers in LTE, for example, Evolved Packet System (EPS) bearers between a UE and a packet data network gateway (PGW), S1 bearers between an eNB and a serving gateway (SGW), and/or an S5/S8 bearer between an SGW and a PGW.

Once a packet associated with a particular QoS flow is received at AN 802 via resource 820A or resource 820B, AN 802 may separate packets into respective QoS flows 856A-856C based on QoS profiles 828. The QoS profiles 828 may be received from an SMF. Each QoS profile may correspond to a QFI, for example, the QFI marked on the uplink packets 812A-812E. Each QoS profile may include QoS parameters such as 5G QoS identifier (5QI) and an allocation and retention priority (ARP). The QoS profile for non-GBR QoS flows may further include additional QoS parameters such as a reflective QoS attribute (RQA). The QoS profile for GBR QoS flows may further include additional QoS parameters such as a guaranteed flow bit rate (GFBR), a maximum flow bit rate (MFBR), and/or a maximum packet loss rate. The 5QI may be a standardized 5QI which has one-to-one mapping to a standardized combination of 5G QoS characteristics per well-known services. The 5QI may be a dynamically assigned 5QI which the standardized 5QI values are not defined. The 5QI may represent 5G QoS characteristics. The 5QI may comprise a resource type, a default priority level, a packet delay budget (PDB), a packet error rate (PER), a maximum data burst volume, and/or an averaging window. The resource type may indicate a non-GBR QoS flow, a GBR QoS flow or a delay-critical GBR QoS flow. The averaging window may represent a duration over which the GFBR and/or MFBR is calculated. ARP may be a priority level comprising pre-emption capability and a pre-emption vulnerability. Based on the ARP, the AN 802 may apply admission control for the QoS flows in a case of resource limitations.

The AN 802 may select one or more N3 tunnels 850 for transmission of the QoS flows 856A-856C. After the packets are divided into QoS flows 856A-856C, the packet may be sent to UPF 805 (e.g., towards a DN) via the selected one or more N3 tunnels 850. The UPF 805 may verify that the QFIs of the uplink packets 812A-812E are aligned with the QoS rules 814 provided to the UE 801. The UPF 805 may measure and/or count packets and/or provide packet metrics to, for example, a PCF.

The figure also illustrates a process for downlink. In particular, one or more applications may generate downlink packets 852A-852E. The UPF 805 may receive downlink packets 852A-852E from one or more DNs and/or one or more other UPFs. As per the QoS model, UPF 805 may apply packet detection rules (PDRs) 854 to downlink packets 852A-852E. Based on PDRs 854, UPF 805 may map packets 852A-852E into QoS flows. In the present illustration, downlink packets 852A, 852B are mapped to QoS flow 856A, downlink packet 852C is mapped to QoS flow 856B, and the remaining packets are mapped to QoS flow 856C.

The QoS flows 856A-856C may be sent to AN 802. The AN 802 may apply resource mapping rules to the QoS flows 856A-856C. In the present illustration, QoS flow 856A is mapped to resource 820A, whereas QoS flows 856B, 856C are mapped to resource 820B. In order to meet QoS requirements, the resource mapping rules may designate more resources to high-priority QoS flows.

FIGS. 9A-9D illustrate example states and state transitions of a wireless device (e.g., a UE). At any given time, the wireless device may have a radio resource control (RRC) state, a registration management (RM) state, and a connection management (CM) state.

FIG. 9A is an example diagram showing RRC state transitions of a wireless device (e.g., a UE). The UE may be in one of three RRC states: RRC idle 910, (e.g., RRC_IDLE), RRC inactive 920 (e.g., RRC_INACTIVE), or RRC connected 930 (e.g., RRC_CONNECTED). The UE may implement different RAN-related control-plane procedures depending on its RRC state. Other elements of the network, for example, a base station, may track the RRC state of one or more UEs and implement RAN-related control-plane procedures appropriate to the RRC state of each.

In RRC connected 930, it may be possible for the UE to exchange data with the network (for example, the base station). The parameters necessary for exchange of data may be established and known to both the UE and the network. The parameters may be referred to and/or included in an RRC context of the UE (sometimes referred to as a UE context). These parameters may include, for example: one or more AS contexts; one or more radio link configuration parameters; bearer configuration information (e.g., relating to a data radio bearer, signaling radio bearer, logical channel, QoS flow, and/or PDU session); security information; and/or PHY, MAC, RLC, PDCP, and/or SDAP layer configuration information. The base station with which the UE is connected may store the RRC context of the UE.

While in RRC connected 930, mobility of the UE may be managed by the access network, whereas the UE itself may manage mobility while in RRC idle 910 and/or RRC inactive 920. While in RRC connected 930, the UE may manage mobility by measuring signal levels (e.g., reference signal levels) from a serving cell and neighboring cells and reporting these measurements to the base station currently serving the UE. The network may initiate handover based on the reported measurements. The RRC state may transition from RRC connected 930 to RRC idle 910 through a connection release procedure 930 or to RRC inactive 920 through a connection inactivation procedure 932.

In RRC idle 910, an RRC context may not be established for the UE. In RRC idle 910, the UE may not have an RRC connection with a base station. While in RRC idle 910, the UE may be in a sleep state for a majority of the time (e.g., to conserve battery power). The UE may wake up periodically (e.g., once in every discontinuous reception cycle) to monitor for paging messages from the access network. Mobility of the UE may be managed by the UE through a procedure known as cell reselection. The RRC state may transition from RRC idle 910 to RRC connected 930 through a connection establishment procedure 913, which may involve a random access procedure, as discussed in greater detail below.

In RRC inactive 920, the RRC context previously established is maintained in the UE and the base station. This may allow for a fast transition to RRC connected 930 with reduced signaling overhead as compared to the transition from RRC idle 910 to RRC connected 930. The RRC state may transition to RRC connected 930 through a connection resume procedure 923. The RRC state may transition to RRC idle 910 though a connection release procedure 921 that may be the same as or similar to connection release procedure 931.

An RRC state may be associated with a mobility management mechanism. In RRC idle 910 and RRC inactive 920, mobility may be managed by the UE through cell reselection. The purpose of mobility management in RRC idle 910 and/or RRC inactive 920 is to allow the network to be able to notify the UE of an event via a paging message without having to broadcast the paging message over the entire mobile communications network. The mobility management mechanism used in RRC idle 910 and/or RRC inactive 920 may allow the network to track the UE on a cell-group level so that the paging message may be broadcast over the cells of the cell group that the UE currently resides within instead of the entire communication network. Tracking may be based on different granularities of grouping. For example, there may be three levels of cell-grouping granularity: individual cells; cells within a RAN area identified by a RAN area identifier (RAI); and cells within a group of RAN areas, referred to as a tracking area and identified by a tracking area identifier (TAI).

Tracking areas may be used to track the UE at the CN level. The CN may provide the UE with a list of TAIs associated with a UE registration area. If the UE moves, through cell reselection, to a cell associated with a TAI not included in the list of TAIs associated with the UE registration area, the UE may perform a registration update with the CN to allow the CN to update the UE's location and provide the UE with a new the UE registration area.

RAN areas may be used to track the UE at the RAN level. For a UE in RRC inactive 920 state, the UE may be assigned a RAN notification area. A RAN notification area may comprise one or more cell identities, a list of RAIs, and/or a list of TAIs. In an example, a base station may belong to one or more RAN notification areas. In an example, a cell may belong to one or more RAN notification areas. If the UE moves, through cell reselection, to a cell not included in the RAN notification area assigned to the UE, the UE may perform a notification area update with the RAN to update the UE's RAN notification area.

A base station storing an RRC context for a UE or a last serving base station of the UE may be referred to as an anchor base station. An anchor base station may maintain an RRC context for the UE at least during a period of time that the UE stays in a RAN notification area of the anchor base station and/or during a period of time that the UE stays in RRC inactive 920.

FIG. 9B is an example diagram showing registration management (RM) state transitions of a wireless device (e.g., a UE). The states are RM deregistered 940, (e.g., RM-DEREGISTERED) and RM registered 950 (e.g., RM-REGISTERED).

In RM deregistered 940, the UE is not registered with the network, and the UE is not reachable by the network. In order to be reachable by the network, the UE must perform an initial registration. As an example, the UE may register with an AMF of the network. If registration is rejected (registration reject 944), then the UE remains in RM deregistered 940. If registration is accepted (registration accept 945), then the UE transitions to RM registered 950. While the UE is RM registered 950, the network may store, keep, and/or maintain a UE context for the UE. The UE context may be referred to as wireless device context. The UE context corresponding to network registration (maintained by the core network) may be different from the RRC context corresponding to RRC state (maintained by an access network, .e.g., a base station). The UE context may comprise a UE identifier and a record of various information relating to the UE, for example, UE capability information, policy information for access and mobility management of the UE, lists of allowed or established slices or PDU sessions, and/or a registration area of the UE (i.e., a list of tracking areas covering the geographical area where the wireless device is likely to be found).

While the UE is RM registered 950, the network may store the UE context of the UE, and, if necessary, use the UE context to reach the UE. Moreover, some services may not be provided by the network unless the UE is registered. The UE may update its UE context while remaining in RM registered 950 (registration update accept 955). For example, if the UE leaves one tracking area and enters another tracking area, the UE may provide a tracking area identifier to the network. The network may deregister the UE, or the UE may deregister itself (deregistration 954). For example, the network may automatically deregister the wireless device if the wireless device is inactive for a certain amount of time. Upon deregistration, the UE may transition to RM deregistered 940.

FIG. 9C is an example diagram showing connection management (CM) state transitions of a wireless device (e.g., a UE), shown from a perspective of the wireless device. The UE may be in CM idle 960 (e.g., CM-IDLE) or CM connected 970 (e.g., CM-CONNECTED).

In CM idle 960, the UE does not have a non access stratum (NAS) signaling connection with the network. As a result, the UE can not communicate with core network functions. The UE may transition to CM connected 970 by establishing a signaling connection (AN signaling connection establishment 967). This transition may be initiated by sending an initial NAS message. The initial NAS message may be a registration request (e.g., if the UE is RM deregistered 940) or a service request (e.g., if the UE is RM registered 950). If the UE is RM registered 950, then the UE may initiate the AN signaling connection establishment by sending a service request, or the network may send a page, thereby triggering the UE to send the service request.

In CM connected 970, the UE can communicate with core network functions using NAS signaling. As an example, the UE may exchange NAS signaling with an AMF for registration management purposes, service request procedures, and/or authentication procedures. As another example, the UE may exchange NAS signaling, with an SMF, to establish and/or modify a PDU session. The network may disconnect the UE, or the UE may disconnect itself (AN signaling connection release 976). For example, if the UE transitions to RM deregistered 940, then the UE may also transition to CM idle 960. When the UE transitions to CM idle 960, the network may deactivate a user plane connection of a PDU session of the UE.

FIG. 9D is an example diagram showing CM state transitions of the wireless device (e.g., a UE), shown from a network perspective (e.g., an AMF). The CM state of the UE, as tracked by the AMF, may be in CM idle 980 (e.g., CM-IDLE) or CM connected 990 (e.g., CM-CONNECTED). When the UE transitions from CM idle 980 to CM connected 990, the AMF may establish an N2 context of the UE (N2 context establishment 989). When the UE transitions from CM connected 990 to CM idle 980, the AMF may release the N2 context of the UE (N2 context release 998).

FIGS. 10-12 illustrate example procedures for registering, service request, and PDU session establishment of a UE.

FIG. 10 illustrates an example of a registration procedure for a wireless device (e.g., a UE). Based on the registration procedure, the UE may transition from, for example, RM deregistered 940 to RM registered 950.

Registration may be initiated by a UE for the purposes of obtaining authorization to receive services, enabling mobility tracking, enabling reachability, or other purposes. The UE may perform an initial registration as a first step toward connection to the network (for example, if the UE is powered on, airplane mode is turned off, etc.). Registration may also be performed periodically to keep the network informed of the UE's presence (for example, while in CM-IDLE state), or in response to a change in UE capability or registration area. Deregistration (not shown in FIG. 10 ) may be performed to stop network access.

At 1010, the UE transmits a registration request to an AN. As an example, the UE may have moved from a coverage area of a previous AMF (illustrated as AMF #1) into a coverage area of a new AMF (illustrated as AMF #2). The registration request may be a NAS message. The registration request may include a UE identifier. The AN may select an AMF for registration of the UE. For example, the AN may select a default AMF. For example, the AN may select an AMF that is already mapped to the UE (e.g., a previous AMF). The NAS registration request may include a network slice identifier and the AN may select an AMF based on the requested slice. After the AMF is selected, the AN may send the registration request to the selected AMF.

At 1020, the AMF that receives the registration request (AMF #2) performs a context transfer. The context may be a UE context, for example, an RRC context for the UE. As an example, AMF #2 may send AMF #1 a message requesting a context of the UE. The message may include the UE identifier. The message may be a Namf_Communication_UEContextTransfer message. AMF #1 may send to AMF #2 a message that includes the requested UE context. This message may be a Namf_Communication_UEContextTransfer message. After the UE context is received, the AMF #2 may coordinate authentication of the UE. After authentication is complete, AMF #2 may send to AMF #1 a message indicating that the UE context transfer is complete. This message may be a Namf_Communication_UEContextTransfer Response message.

Authentication may require participation of the UE, an AUSF, a UDM and/or a UDR (not shown). For example, the AMF may request that the AUSF authenticate the UE. For example, the AUSF may execute authentication of the UE. For example, the AUSF may get authentication data from UDM. For example, the AUSF may send a subscription permanent identifier (SUPI) to the AMF based on the authentication being successful. For example, the AUSF may provide an intermediate key to the AMF. The intermediate key may be used to derive an access-specific security key for the UE, enabling the AMF to perform security context management (SCM). The AUSF may obtain subscription data from the UDM. The subscription data may be based on information obtained from the UDM (and/or the UDR). The subscription data may include subscription identifiers, security credentials, access and mobility related subscription data and/or session related data.

At 1030, the new AMF, AMF #2, registers and/or subscribes with the UDM. AMF #2 may perform registration using a UE context management service of the UDM (Nudm_UECM). AMF #2 may obtain subscription information of the UE using a subscriber data management service of the UDM (Nudm_SDM). AMF #2 may further request that the UDM notify AMF #2 if the subscription information of the UE changes. As the new AMF registers and subscribes, the old AMF, AMF #1, may deregister and unsubscribe. After deregistration, AMF #1 is free of responsibility for mobility management of the UE.

At 1040, AMF #2 retrieves access and mobility (AM) policies from the PCF. As an example, the AMF #2 may provide subscription data of the UE to the PCF. The PCF may determine access and mobility policies for the UE based on the subscription data, network operator data, current network conditions, and/or other suitable information. For example, the owner of a first UE may purchase a higher level of service than the owner of a second UE. The PCF may provide the rules associated with the different levels of service. Based on the subscription data of the respective UEs, the network may apply different policies which facilitate different levels of service.

For example, access and mobility policies may relate to service area restrictions, RAT/frequency selection priority (RFSP, where RAT stands for radio access technology), authorization and prioritization of access type (e.g., LTE versus NR), and/or selection of non-3GPP access (e.g., Access Network Discovery and Selection Policy (ANDSP)). The service area restrictions may comprise a list of tracking areas where the UE is allowed to be served (or forbidden from being served). The access and mobility policies may include a UE route selection policy (URSP)) that influences routing to an established PDU session or a new PDU session. As noted above, different policies may be obtained and/or enforced based on subscription data of the UE, location of the UE (i.e., location of the AN and/or AMF), or other suitable factors.

At 1050, AMF #2 may update a context of a PDU session. For example, if the UE has an existing PDU session, the AMF #2 may coordinate with an SMF to activate a user plane connection associated with the existing PDU session. The SMF may update and/or release a session management context of the PDU session (Nsmf_PDUSession_UpdateSMContext, Nsmf_PDUSession_ReleaseSMContext).

At 1060, AMF #2 sends a registration accept message to the AN, which forwards the registration accept message to the UE. The registration accept message may include a new UE identifier and/or a new configured slice identifier. The UE may transmit a registration complete message to the AN, which forwards the registration complete message to the AMF #2. The registration complete message may acknowledge receipt of the new UE identifier and/or new configured slice identifier.

At 1070, AMF #2 may obtain UE policy control information from the PCF. The PCF may provide an access network discovery and selection policy (ANDSP) to facilitate non-3GPP access. The PCF may provide a UE route selection policy (URSP) to facilitate mapping of particular data traffic to particular PDU session connectivity parameters. As an example, the URSP may indicate that data traffic associated with a particular application should be mapped to a particular SSC mode, network slice, PDU session type, or preferred access type (3GPP or non-3GPP).

FIG. 11 illustrates an example of a service request procedure for a wireless device (e.g., a UE). The service request procedure depicted in FIG. 11 is a network-triggered service request procedure for a UE in a CM-IDLE state. However, other service request procedures (e.g., a UE-triggered service request procedure) may also be understood by reference to FIG. 11 , as will be discussed in greater detail below.

At 1110, a UPF receives data. The data may be downlink data for transmission to a UE. The data may be associated with an existing PDU session between the UE and a DN. The data may be received, for example, from a DN and/or another UPF. The UPF may buffer the received data. In response to the receiving of the data, the UPF may notify an SMF of the received data. The identity of the SMF to be notified may be determined based on the received data. The notification may be, for example, an N4 session report. The notification may indicate that the UPF has received data associated with the UE and/or a particular PDU session associated with the UE. In response to receiving the notification, the SMF may send PDU session information to an AMF. The PDU session information may be sent in an N1N2 message transfer for forwarding to an AN. The PDU session information may include, for example, UPF tunnel endpoint information and/or QoS information.

At 1120, the AMF determines that the UE is in a CM-IDLE state. The determining at 1120 may be in response to the receiving of the PDU session information. Based on the determination that the UE is CM-IDLE, the service request procedure may proceed to 1130 and 1140, as depicted in FIG. 11 . However, if the UE is not CM-IDLE (e.g., the UE is CM-CONNECTED), then 1130 and 1140 may be skipped, and the service request procedure may proceed directly to 1150.

At 1130, the AMF pages the UE. The paging at 1130 may be performed based on the UE being CM-IDLE. To perform the paging, the AMF may send a page to the AN. The page may be referred to as a paging or a paging message. The page may be an N2 request message. The AN may be one of a plurality of ANs in a RAN notification area of the UE. The AN may send a page to the UE. The UE may be in a coverage area of the AN and may receive the page.

At 1140, the UE may request service. The UE may transmit a service request to the AMF via the AN. As depicted in FIG. 11 , the UE may request service at 1140 in response to receiving the paging at 1130. However, as noted above, this is for the specific case of a network-triggered service request procedure. In some scenarios (for example, if uplink data becomes available at the UE), then the UE may commence a UE-triggered service request procedure. The UE-triggered service request procedure may commence starting at 1140.

At 1150, the network may authenticate the UE. Authentication may require participation of the UE, an AUSF, and/or a UDM, for example, similar to authentication described elsewhere in the present disclosure. In some cases (for example, if the UE has recently been authenticated), the authentication at 1150 may be skipped.

At 1160, the AMF and SMF may perform a PDU session update. As part of the PDU session update, the SMF may provide the AMF with one or more UPF tunnel endpoint identifiers. In some cases (not shown in FIG. 11 ), it may be necessary for the SMF to coordinate with one or more other SMFs and/or one or more other UPFs to set up a user plane.

At 1170, the AMF may send PDU session information to the AN. The PDU session information may be included in an N2 request message. Based on the PDU session information, the AN may configure a user plane resource for the UE. To configure the user plane resource, the AN may, for example, perform an RRC reconfiguration of the UE. The AN may acknowledge to the AMF that the PDU session information has been received. The AN may notify the AMF that the user plane resource has been configured, and/or provide information relating to the user plane resource configuration.

In the case of a UE-triggered service request procedure, the UE may receive, at 1170, a NAS service accept message from the AMF via the AN. After the user plane resource is configured, the UE may transmit uplink data (for example, the uplink data that caused the UE to trigger the service request procedure).

At 1180, the AMF may update a session management (SM) context of the PDU session. For example, the AMF may notify the SMF (and/or one or more other associated SMFs) that the user plane resource has been configured, and/or provide information relating to the user plane resource configuration. The AMF may provide the SMF (and/or one or more other associated SMFs) with one or more AN tunnel endpoint identifiers of the AN. After the SM context update is complete, the SMF may send an update SM context response message to the AMF.

Based on the update of the session management context, the SMF may update a PCF for purposes of policy control. For example, if a location of the UE has changed, the SMF may notify the PCF of the UE's a new location.

Based on the update of the session management context, the SMF and UPF may perform a session modification. The session modification may be performed using N4 session modification messages. After the session modification is complete, the UPF may transmit downlink data (for example, the downlink data that caused the UPF to trigger the network-triggered service request procedure) to the UE. The transmitting of the downlink data may be based on the one or more AN tunnel endpoint identifiers of the AN.

FIG. 12 illustrates an example of a protocol data unit (PDU) session establishment procedure for a wireless device (e.g., a UE). The UE may determine to transmit the PDU session establishment request to create a new PDU session, to hand over an existing PDU session to a 3GPP network, or for any other suitable reason.

At 1210, the UE initiates PDU session establishment. The UE may transmit a PDU session establishment request to an AMF via an AN. The PDU session establishment request may be a NAS message. The PDU session establishment request may indicate: a PDU session ID; a requested PDU session type (new or existing); a requested DN (DNN); a requested network slice (S-NSSAI); a requested SSC mode; and/or any other suitable information. The PDU session ID may be generated by the UE. The PDU session type may be, for example, an Internet Protocol (IP)-based type (e.g., IPv4, IPv6, or dual stack IPv4/IPv6), an Ethernet type, or an unstructured type.

The AMF may select an SMF based on the PDU session establishment request. In some scenarios, the requested PDU session may already be associated with a particular SMF. For example, the AMF may store a UE context of the UE, and the UE context may indicate that the PDU session ID of the requested PDU session is already associated with the particular SMF. In some scenarios, the AMF may select the SMF based on a determination that the SMF is prepared to handle the requested PDU session. For example, the requested PDU session may be associated with a particular DNN and/or S-NSSAI, and the SMF may be selected based on a determination that the SMF can manage a PDU session associated with the particular DNN and/or S-NSSAI.

At 1220, the network manages a context of the PDU session. After selecting the SMF at 1210, the AMF sends a PDU session context request to the SMF. The PDU session context request may include the PDU session establishment request received from the UE at 1210. The PDU session context request may be a Nsmf_PDUSession_CreateSMContext Request and/or a Nsmf_PDUSession_UpdateSMContext Request. The PDU session context request may indicate identifiers of the UE; the requested DN; and/or the requested network slice. Based on the PDU session context request, the SMF may retrieve subscription data from a UDM. The subscription data may be session management subscription data of the UE. The SMF may subscribe for updates to the subscription data, so that the PCF will send new information if the subscription data of the UE changes. After the subscription data of the UE is obtained, the SMF may transmit a PDU session context response to the AMG. The PDU session context response may be a Nsmf_PDUSession_CreateSMContext Response and/or a Nsmf_PDUSession_UpdateSMContext Response. The PDU session context response may include a session management context ID.

At 1230, secondary authorization/authentication may be performed, if necessary. The secondary authorization/authentication may involve the UE, the AMF, the SMF, and the DN. The SMF may access the DN via a Data Network Authentication, Authorization and Accounting (DN AAA) server.

At 1240, the network sets up a data path for uplink data associated with the PDU session. The SMF may select a PCF and establish a session management policy association. Based on the association, the PCF may provide an initial set of policy control and charging rules (PCC rules) for the PDU session. When targeting a particular PDU session, the PCF may indicate, to the SMF, a method for allocating an IP address to the PDU Session, a default charging method for the PDU session, an address of the corresponding charging entity, triggers for requesting new policies, etc. The PCF may also target a service data flow (SDF) comprising one or more PDU sessions. When targeting an SDF, the PCF may indicate, to the SMF, policies for applying QoS requirements, monitoring traffic (e.g., for charging purposes), and/or steering traffic (e.g., by using one or more particular N6 interfaces).

The SMF may determine and/or allocate an IP address for the PDU session. The SMF may select one or more UPFs (a single UPF in the example of FIG. 12 ) to handle the PDU session. The SMF may send an N4 session message to the selected UPF. The N4 session message may be an N4 Session Establishment Request and/or an N4 Session Modification Request. The N4 session message may include packet detection, enforcement, and reporting rules associated with the PDU session. In response, the UPF may acknowledge by sending an N4 session establishment response and/or an N4 session modification response.

The SMF may send PDU session management information to the AMF. The PDU session management information may be a Namf_Communication_N1N2MessageTransfer message. The PDU session management information may include the PDU session ID. The PDU session management information may be a NAS message. The PDU session management information may include N1 session management information and/or N2 session management information. The N1 session management information may include a PDU session establishment accept message. The PDU session establishment accept message may include tunneling endpoint information of the UPF and quality of service (QoS) information associated with the PDU session.

The AMF may send an N2 request to the AN. The N2 request may include the PDU session establishment accept message. Based on the N2 request, the AN may determine AN resources for the UE. The AN resources may be used by the UE to establish the PDU session, via the AN, with the DN. The AN may determine resources to be used for the PDU session and indicate the determined resources to the UE. The AN may send the PDU session establishment accept message to the UE. For example, the AN may perform an RRC reconfiguration of the UE. After the AN resources are set up, the AN may send an N2 request acknowledge to the AMF. The N2 request acknowledge may include N2 session management information, for example, the PDU session ID and tunneling endpoint information of the AN.

After the data path for uplink data is set up at 1240, the UE may optionally send uplink data associated with the PDU session. As shown in FIG. 12 , the uplink data may be sent to a DN associated with the PDU session via the AN and the UPF.

At 1250, the network may update the PDU session context. The AMF may transmit a PDU session context update request to the SMF. The PDU session context update request may be a Nsmf_PDUSession_UpdateSMContext Request. The PDU session context update request may include the N2 session management information received from the AN. The SMF may acknowledge the PDU session context update. The acknowledgement may be a Nsmf_PDUSession_UpdateSMContext Response. The acknowledgement may include a subscription requesting that the SMF be notified of any UE mobility event. Based on the PDU session context update request, the SMF may send an N4 session message to the UPF. The N4 session message may be an N4 Session Modification Request. The N4 session message may include tunneling endpoint information of the AN. The N4 session message may include forwarding rules associated with the PDU session. In response, the UPF may acknowledge by sending an N4 session modification response.

After the UPF receives the tunneling endpoint information of the AN, the UPF may relay downlink data associated with the PDU session. As shown in FIG. 12 , the downlink data may be received from a DN associated with the PDU session via the AN and the UPF.

FIG. 13 illustrates examples of components of the elements in a communications network. FIG. 13 includes a wireless device 1310, a base station 1320, and a physical deployment of one or more network functions 1330 (henceforth “deployment 1330”). Any wireless device described in the present disclosure may have similar components and may be implemented in a similar manner as the wireless device 1310. Any other base station described in the present disclosure (or any portion thereof, depending on the architecture of the base station) may have similar components and may be implemented in a similar manner as the base station 1320. Any physical core network deployment in the present disclosure (or any portion thereof, depending on the architecture of the base station) may have similar components and may be implemented in a similar manner as the deployment 1330.

The wireless device 1310 may communicate with base station 1320 over an air interface 1370. The communication direction from wireless device 1310 to base station 1320 over air interface 1370 is known as uplink, and the communication direction from base station 1320 to wireless device 1310 over air interface 1370 is known as downlink. Downlink transmissions may be separated from uplink transmissions using FDD, TDD, and/or some combination of duplexing techniques. FIG. 13 shows a single wireless device 1310 and a single base station 1320, but it will be understood that wireless device 1310 may communicate with any number of base stations or other access network components over air interface 1370, and that base station 1320 may communicate with any number of wireless devices over air interface 1370.

The wireless device 1310 may comprise a processing system 1311 and a memory 1312. The memory 1312 may comprise one or more computer-readable media, for example, one or more non-transitory computer readable media. The memory 1312 may include instructions 1313. The processing system 1311 may process and/or execute instructions 1313. Processing and/or execution of instructions 1313 may cause wireless device 1310 and/or processing system 1311 to perform one or more functions or activities. The memory 1312 may include data (not shown). One of the functions or activities performed by processing system 1311 may be to store data in memory 1312 and/or retrieve previously stored data from memory 1312. In an example, downlink data received from base station 1320 may be stored in memory 1312, and uplink data for transmission to base station 1320 may be retrieved from memory 1312. As illustrated in FIG. 13 , the wireless device 1310 may communicate with base station 1320 using a transmission processing system 1314 and/or a reception processing system 1315. Alternatively, transmission processing system 1314 and reception processing system 1315 may be implemented as a single processing system, or both may be omitted and all processing in the wireless device 1310 may be performed by the processing system 1311. Although not shown in FIG. 13 , transmission processing system 1314 and/or reception processing system 1315 may be coupled to a dedicated memory that is analogous to but separate from memory 1312, and comprises instructions that may be processed and/or executed to carry out one or more of their respective functionalities. The wireless device 1310 may comprise one or more antennas 1316 to access air interface 1370.

The wireless device 1310 may comprise one or more other elements 1319. The one or more other elements 1319 may comprise software and/or hardware that provide features and/or functionalities, for example, a speaker, a microphone, a keypad, a display, a touchpad, a satellite transceiver, a universal serial bus (USB) port, a hands-free headset, a frequency modulated (FM) radio unit, a media player, an Internet browser, an electronic control unit (e.g., for a motor vehicle), and/or one or more sensors (e.g., an accelerometer, a gyroscope, a temperature sensor, a radar sensor, a lidar sensor, an ultrasonic sensor, a light sensor, a camera, a global positioning sensor (GPS) and/or the like). The wireless device 1310 may receive user input data from and/or provide user output data to the one or more one or more other elements 1319. The one or more other elements 1319 may comprise a power source. The wireless device 1310 may receive power from the power source and may be configured to distribute the power to the other components in wireless device 1310. The power source may comprise one or more sources of power, for example, a battery, a solar cell, a fuel cell, or any combination thereof.

The wireless device 1310 may transmit uplink data to and/or receive downlink data from base station 1320 via air interface 1370. To perform the transmission and/or reception, one or more of the processing system 1311, transmission processing system 1314, and/or reception system 1315 may implement open systems interconnection (OSI) functionality. As an example, transmission processing system 1314 and/or reception system 1315 may perform layer 1 OSI functionality, and processing system 1311 may perform higher layer functionality. The wireless device 1310 may transmit and/or receive data over air interface 1370 using one or more antennas 1316. For scenarios where the one or more antennas 1316 include multiple antennas, the multiple antennas may be used to perform one or more multi-antenna techniques, such as spatial multiplexing (e.g., single-user multiple-input multiple output (MIMO) or multi-user MIMO), transmit/receive diversity, and/or beamforming.

The base station 1320 may comprise a processing system 1321 and a memory 1322. The memory 1322 may comprise one or more computer-readable media, for example, one or more non-transitory computer readable media. The memory 1322 may include instructions 1323. The processing system 1321 may process and/or execute instructions 1323. Processing and/or execution of instructions 1323 may cause base station 1320 and/or processing system 1321 to perform one or more functions or activities. The memory 1322 may include data (not shown). One of the functions or activities performed by processing system 1321 may be to store data in memory 1322 and/or retrieve previously stored data from memory 1322. The base station 1320 may communicate with wireless device 1310 using a transmission processing system 1324 and a reception processing system 1325. Although not shown in FIG. 13 , transmission processing system 1324 and/or reception processing system 1325 may be coupled to a dedicated memory that is analogous to but separate from memory 1322, and comprises instructions that may be processed and/or executed to carry out one or more of their respective functionalities. The wireless device 1320 may comprise one or more antennas 1326 to access air interface 1370.

The base station 1320 may transmit downlink data to and/or receive uplink data from wireless device 1310 via air interface 1370. To perform the transmission and/or reception, one or more of the processing system 1321, transmission processing system 1324, and/or reception system 1325 may implement OSI functionality. As an example, transmission processing system 1324 and/or reception system 1325 may perform layer 1 OSI functionality, and processing system 1321 may perform higher layer functionality. The base station 1320 may transmit and/or receive data over air interface 1370 using one or more antennas 1326. For scenarios where the one or more antennas 1326 include multiple antennas, the multiple antennas may be used to perform one or more multi-antenna techniques, such as spatial multiplexing (e.g., single-user multiple-input multiple output (MIMO) or multi-user MIMO), transmit/receive diversity, and/or beamforming.

The base station 1320 may comprise an interface system 1327. The interface system 1327 may communicate with one or more base stations and/or one or more elements of the core network via an interface 1380. The interface 1380 may be wired and/or wireless and interface system 1327 may include one or more components suitable for communicating via interface 1380. In FIG. 13 , interface 1380 connects base station 1320 to a single deployment 1330, but it will be understood that wireless device 1310 may communicate with any number of base stations and/or CN deployments over interface 1380, and that deployment 1330 may communicate with any number of base stations and/or other CN deployments over interface 1380. The base station 1320 may comprise one or more other elements 1329 analogous to one or more of the one or more other elements 1319.

The deployment 1330 may comprise any number of portions of any number of instances of one or more network functions (NFs). The deployment 1330 may comprise a processing system 1331 and a memory 1332. The memory 1332 may comprise one or more computer-readable media, for example, one or more non-transitory computer readable media. The memory 1332 may include instructions 1333. The processing system 1331 may process and/or execute instructions 1333. Processing and/or execution of instructions 1333 may cause the deployment 1330 and/or processing system 1331 to perform one or more functions or activities. The memory 1332 may include data (not shown). One of the functions or activities performed by processing system 1331 may be to store data in memory 1332 and/or retrieve previously stored data from memory 1332. The deployment 1330 may access the interface 1380 using an interface system 1337. The deployment 1330 may comprise one or more other elements 1339 analogous to one or more of the one or more other elements 1319.

One or more of the systems 1311, 1314, 1315, 1321, 1324, 1325, and/or 1331 may comprise one or more controllers and/or one or more processors. The one or more controllers and/or one or more processors may comprise, for example, a general-purpose processor, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) and/or other programmable logic device, discrete gate and/or transistor logic, discrete hardware components, an on-board unit, or any combination thereof. One or more of the systems 1311, 1314, 1315, 1321, 1324, 1325, and/or 1331 may perform signal coding/processing, data processing, power control, input/output processing, and/or any other functionality that may enable wireless device 1310, base station 1320, and/or deployment 1330 to operate in a mobile communications system.

Many of the elements described in the disclosed embodiments may be implemented as modules. A module is defined here as an element that performs a defined function and has a defined interface to other elements. The modules described in this disclosure may be implemented in hardware, software in combination with hardware, firmware, wetware (e.g., hardware with a biological element) or a combination thereof, which may be behaviorally equivalent. For example, modules may be implemented as a software routine written in a computer language configured to be executed by a hardware machine (such as C, C++, Fortran, Java, Basic, Matlab or the like) or a modeling/simulation program such as Simulink, Stateflow, GNU Octave, or LabVIEWMathScript. It may be possible to implement modules using physical hardware that incorporates discrete or programmable analog, digital and/or quantum hardware. Examples of programmable hardware comprise computers, microcontrollers, microprocessors, DSPs, ASICs, FPGAs, and complex programmable logic devices (CPLDs). Computers, microcontrollers and microprocessors may be programmed using languages such as assembly, C, C++ or the like. FPGAs, ASICs and CPLDs are often programmed using hardware description languages (HDL) such as VHSIC hardware description language (VHDL) or Verilog that configure connections between internal hardware modules with lesser functionality on a programmable device. The mentioned technologies are often used in combination to achieve the result of a functional module.

The wireless device 1310, base station 1320, and/or deployment 1330 may implement timers and/or counters. A timer/counter may start at an initial value. As used herein, starting may comprise restarting. Once started, the timer/counter may run. Running of the timer/counter may be associated with an occurrence. When the occurrence occurs, the value of the timer/counter may change (for example, increment or decrement). The occurrence may be, for example, an exogenous event (for example, a reception of a signal, a measurement of a condition, etc.), an endogenous event (for example, a transmission of a signal, a calculation, a comparison, a performance of an action or a decision to so perform, etc.), or any combination thereof. In the case of a timer, the occurrence may be the passage of a particular amount of time. However, it will be understood that a timer may be described and/or implemented as a counter that counts the passage of a particular unit of time. A timer/counter may run in a direction of a final value until it reaches the final value. The reaching of the final value may be referred to as expiration of the timer/counter. The final value may be referred to as a threshold. A timer/counter may be paused, wherein the present value of the timer/counter is held, maintained, and/or carried over, even upon the occurrence of one or more occurrences that would otherwise cause the value of the timer/counter to change. The timer/counter may be un-paused or continued, wherein the value that was held, maintained, and/or carried over begins changing again when the one or more occurrence occur. A timer/counter may be set and/or reset. As used herein, setting may comprise resetting. When the timer/counter sets and/or resets, the value of the timer/counter may be set to the initial value. A timer/counter may be started and/or restarted. As used herein, starting may comprise restarting. In some embodiments, when the timer/counter restarts, the value of the timer/counter may be set to the initial value and the timer/counter may begin to run.

FIGS. 14A, 14B, 14C, and 14D illustrate various example arrangements of physical core network deployments, each having one or more network functions or portions thereof. The core network deployments comprise a deployment 1410, a deployment 1420, a deployment 1430, a deployment 1440, and/or a deployment 1450. Each deployment may be analogous to, for example, the deployment 1330 depicted in FIG. 13 . In particular, each deployment may comprise a processing system for performing one or more functions or activities, memory for storing data and/or instructions, and an interface system for communicating with other network elements (for example, other core network deployments). Each deployment may comprise one or more network functions (NFs). The term NF may refer to a particular set of functionalities and/or one or more physical elements configured to perform those functionalities (e.g., a processing system and memory comprising instructions that, when executed by the processing system, cause the processing system to perform the functionalities). For example, in the present disclosure, when a network function is described as performing X, Y, and Z, it will be understood that this refers to the one or more physical elements configured to perform X, Y, and Z, no matter how or where the one or more physical elements are deployed. The term NF may refer to a network node, network element, and/or network device.

As will be discussed in greater detail below, there are many different types of NF and each type of NF may be associated with a different set of functionalities. A plurality of different NFs may be flexibly deployed at different locations (for example, in different physical core network deployments) or in a same location (for example, co-located in a same deployment). A single NF may be flexibly deployed at different locations (implemented using different physical core network deployments) or in a same location. Moreover, physical core network deployments may also implement one or more base stations, application functions (AFs), data networks (DNs), or any portions thereof. NFs may be implemented in many ways, including as network elements on dedicated or shared hardware, as software instances running on dedicated or shared hardware, or as virtualized functions instantiated on a platform (e.g., a cloud-based platform).

FIG. 14A illustrates an example arrangement of core network deployments in which each deployment comprises one network function. A deployment 1410 comprises an NF 1411, a deployment 1420 comprises an NF 1421, and a deployment 1430 comprises an NF 1431. The deployments 1410, 1420, 1430 communicate via an interface 1490. The deployments 1410, 1420, 1430 may have different physical locations with different signal propagation delays relative to other network elements. The diversity of physical locations of deployments 1410, 1420, 1430 may enable provision of services to a wide area with improved speed, coverage, security, and/or efficiency.

FIG. 14B illustrates an example arrangement wherein a single deployment comprises more than one NF. Unlike FIG. 14A, where each NF is deployed in a separate deployment, FIG. 14B illustrates multiple NFs in deployments 1410, 1420. In an example, deployments 1410, 1420 may implement a software-defined network (SDN) and/or a network function virtualization (NFV).

For example, deployment 1410 comprises an additional network function, NF 1411A. The NFs 1411, 1411A may consist of multiple instances of the same NF type, co-located at a same physical location within the same deployment 1410. The NFs 1411, 1411A may be implemented independently from one another (e.g., isolated and/or independently controlled). For example, the NFs 1411, 1411A may be associated with different network slices. A processing system and memory associated with the deployment 1410 may perform all of the functionalities associated with the NF 1411 in addition to all of the functionalities associated with the NF 1411A. In an example, NFs 1411, 1411A may be associated with different PLMNs, but deployment 1410, which implements NFs 1411, 1411A, may be owned and/or operated by a single entity.

Elsewhere in FIG. 14B, deployment 1420 comprises NF 1421 and an additional network function, NF 1422. The NFs 1421, 1422 may be different NF types. Similar to NFs 1411, 1411A, the NFs 1421, 1422 may be co-located within the same deployment 1420, but separately implemented. As an example, a first PLMN may own and/or operate deployment 1420 having NFs 1421, 1422. As another example, the first PLMN may implement NF 1421 and a second PLMN may obtain from the first PLMN (e.g., rent, lease, procure, etc.) at least a portion of the capabilities of deployment 1420 (e.g., processing power, data storage, etc.) in order to implement NF 1422. As yet another example, the deployment may be owned and/or operated by one or more third parties, and the first PLMN and/or second PLMN may procure respective portions of the capabilities of the deployment 1420. When multiple NFs are provided at a single deployment, networks may operate with greater speed, coverage, security, and/or efficiency.

FIG. 14C illustrates an example arrangement of core network deployments in which a single instance of an NF is implemented using a plurality of different deployments. In particular, a single instance of NF 1422 is implemented at deployments 1420, 1440. As an example, the functionality provided by NF 1422 may be implemented as a bundle or sequence of subservices. Each subservice may be implemented independently, for example, at a different deployment. Each subservices may be implemented in a different physical location. By distributing implementation of subservices of a single NF across different physical locations, the mobile communications network may operate with greater speed, coverage, security, and/or efficiency.

FIG. 14D illustrates an example arrangement of core network deployments in which one or more network functions are implemented using a data processing service. In FIG. 14D, NFs 1411, 1411A, 1421, 1422 are included in a deployment 1450 that is implemented as a data processing service. The deployment 1450 may comprise, for example, a cloud network and/or data center. The deployment 1450 may be owned and/or operated by a PLMN or by a non-PLMN third party. The NFs 1411, 1411A, 1421, 1422 that are implemented using the deployment 1450 may belong to the same PLMN or to different PLMNs. The PLMN(s) may obtain (e.g., rent, lease, procure, etc.) at least a portion of the capabilities of the deployment 1450 (e.g., processing power, data storage, etc.). By providing one or more NFs using a data processing service, the mobile communications network may operate with greater speed, coverage, security, and/or efficiency.

As shown in the figures, different network elements (e.g., NFs) may be located in different physical deployments, or co-located in a single physical deployment. It will be understood that in the present disclosure, the sending and receiving of messages among different network elements is not limited to inter-deployment transmission or intra-deployment transmission, unless explicitly indicated.

In an example, a deployment may be a ‘black box’ that is preconfigured with one or more NFs and preconfigured to communicate, in a prescribed manner, with other ‘black box’ deployments (e.g., via the interface 1490). Additionally or alternatively, a deployment may be configured to operate in accordance with open-source instructions (e.g., software) designed to implement NFs and communicate with other deployments in a transparent manner. The deployment may operate in accordance with open RAN (O-RAN) standards.

Each CN deployment may comprise one or more network functions. Depending on the context in which the term is used, a network function (NF) may refer to a particular set of functionalities and/or one or more physical elements configured to perform those functionalities (e.g., a processing system and memory comprising instructions that, when executed by the processing system, cause the processing system to perform the functionalities). There are many different types of NF and each type of NF may be associated with a different set of functionalities. Different NFs may be flexibly deployed at different locations (for example, in different physical core network deployments) or in a same location (for example, co-located in the same physical core network deployment). Moreover, physical CN deployments are not limited to implementation of NFs. For example, a particular physical CN deployment may further include a base station or portions thereof and/or a data network or portions thereof. Accordingly, one or more NFs implemented on a particular physical core network deployment may be co-located with one or more non-core elements, including elements of an access network or data network.

FIG. 15 illustrates a service-based architecture for a 5G network regarding a control plane (CP) and a user plane (UP) interaction. This illustration may depict logical connections between nodes and functions, and its illustrated connections may not be interpreted as direct physical connections. A wireless device may form a radio access network connection with a bases station, which is connected to a User Plane (UP) Function (UPF) over a network interface providing a defined interface such as an N3 interface. The UPF may provide a logical connection to a data network (DN) over a network interface such as an N6 interface. The radio access network connection between the wireless device and the base station may be referred to as a data radio bearer (DRB).

The DN may be a data network used to provide an operator service, third party service such as the Internet, IP multimedia subsystem (IMS), augmented reality (AR), virtual reality (VR). In some embodiments DN may represent an edge computing network or resource, such as a mobile edge computing (MEC) network.

The wireless device also connects to the AMF through a logical N1 connection. The AMF may be responsible for authentication and authorization of access requests, as well as mobility management functions. The AMF may perform other roles and functions. In a service-based view, AMF may communicate with other core network control plane functions through a service-based interface denoted as Namf.

The SMF is a network function that may be responsible for the allocation and management of IP addresses that are assigned to a wireless device as well as the selection of a UPF for traffic associated with a particular session of the wireless device. There will typically be multiple SMFs in the network, each of which may be associated with a respective group of wireless devices, base stations or UPFs. The SMF may communicate with other core network functions, in a service based view, through a service based interface denoted as Nsmf. The SMF may also connect to a UPF through a logical interface such as network interface N4.

The authentication server function (AUSF) may provide authentication services to other network functions over a service based Nausf interface. A network exposure function (NEF) can be deployed in the network to allow servers, functions, and other entities such as those outside a trusted domain (operator network) to have exposure to services and capabilities within the network. In one such example, the NEF may act like a proxy between an external application server (AS) outside the illustrated network and network functions such as the PCF, the SMF, the UDM and the AMF. The external AS may provide information that may be of use in the setup of the parameters associated with a data session. The NEF may communicate with other network functions through a service based Nnef network interface. The NEF may have an interface to non-3GPP functions.

The Network Repository Function (NRF) may provide network service discovery functionality. The NRF may be specific to the Public Land Mobility Network (PLMN) or network operator, with which it is associated. The service discovery functionality can allow network functions and wireless devices connected to the network to determine where and how to access existing network functions.

The PCF may communicate with other network functions over a service based Npcf interface, and may be used to provide policy and rules to other network functions, including those within the control plane. Enforcement and application of the policies and rules may not be responsibility of the PCF. The responsibility of the functions to which the PCF transmits the policy may be responsibility of the AMF or the SMF. In one such example, the PCF may transmit policy associated with session management to the SMF. This may be used to allow for a unified policy framework with which network behavior can be governed.

The UDM may present a service based Nudm interface to communicate with other network functions. The UDM may provide data storage facilities to other network functions. Unified data storage may allow for a consolidated view of network information that may be used to ensure that the most relevant information can be made available to different network functions from a single resource. This may allow implementation of other network functions easier, as they may not need to determine where a particular type of data is stored in the network. The UDM may employ an interface, such as Nudr to connect to the UDR. The PCF may be associated with the UDM.

The PCF may have a direct interface to the UDR or may use Nudr interface to connect with UDR. The UDM may receive requests to retrieve content stored in the UDR, or requests to store content in the UDR. The UDM may be responsible for functionality such as the processing of credentials, location management and subscription management. The UDR may also support authentication credential processing, user identification handling, access authorization, registration/mobility management, subscription management, and short message service (SMS) management. The UDR may be responsible for storing data provided by the UDM. The stored data is associated with policy profile information (which may be provided by PCF) that governs the access rights to the stored data. In some embodiments, the UDR may store policy data, as well as user subscription data which may include any or all of subscription identifiers, security credentials, access and mobility related subscription data and session related data.

The Application Function (AF) may represent the non-data plane (also referred to as the non-user plane) functionality of an application deployed within a network operator domain and within a 3GPP compliant network. The AF may in internal application server (AS). The AF may interact with other core network functions through a service based Naf interface, and may access network capability exposure information, as well as provide application information for use in decisions such as traffic routing. The AF can also interact with functions such as the PCF to provide application specific input into policy and policy enforcement decisions. In many situations, the AF may not provide network services to other network functions. The AF may be often viewed as a consumer or user of services provided by other network functions. An application (application server) outside of the trusted domain (operator network), may perform many of the same functions as AF through the use of NEF.

The wireless device may communicate with network functions that are in the core network control plane (CN-UP), and the core network user plane (CN-CP). The UPF and the data network (DN) are a part of the CN-UP. The DN may be out of core network domain (cellular network domain). In the illustration (FIG. 15 ), base station is located in the CP-UP side. The base station may provide connectivity both for the CN-CP & CN-UP. AMF, SMF, AUSF, NEF, NRF, PCF, and UDM may be functions that reside within the CN-CP, and are often referred to as control plane functions. If the AF resides in the trusted domain, the AF may communicate with other functions within CN-CP directly via the service based Naf interface. If the AF resides outside of the trusted domain, the AM may communicate with other functions within CN-CP indirectly via the NEF.

An unmanned aerial vehicle (UAV) may be an aircraft without a human pilot on board. An unmanned aerial system (UAS) may be an entire system needed to operate the UAV. As illustrated in FIG. 16 , the UAS may comprise the UAV, a ground control system (e.g., UAV controller), a camera, a positioning system, one or more software, and skills needed to operate the UAS. Wireless network (e.g., cellular network, 4G cellular network, 5G cellular network), which may enable the ground control system (e.g., UAV controller, UTM) to communicate with the UAV may be one of the components of the UAS.

In an example, a wireless device may be the UAV. The wireless device may be an aerial wireless device. The wireless device may fly above the ground. As illustrated in FIG. 17 , the wireless device may experience high line-of-sight (LOS) propagation probability. The wireless device may receive downlink (e.g., from a base station to the wireless device) interference from a larger number of cells than a typical terrestrial wireless device does. In the downlink direction, there may be higher probability that the number of neighboring cells causing high level of downlink interference at the wireless device than in the case of terrestrial wireless device. In an example, 16 cells causing high level of downlink direction interference may be observed by the wireless device at heights of 50 m or above. In an example, antennas of a base station (e.g., eNB, gNB) may be down tilted to serve terrestrial wireless devices. The wireless device may locate above a height of the antennas of the base station. The wireless devices may be served by side lobes of the antennas of the base station. The wireless device may see a stronger signal from a faraway base stations than the one that is geographically closest. The wireless devices may be served by a faraway base station instead of the closest one. Downlink direction pathloss and uplink direction pathloss for the aerial wireless device may differ in some scenarios where reciprocity does not hold (e.g., due to different side lobe orientations in uplink and downlink, or different channel characteristic in a frequency domain division deployment (FDD).

Base stations of the wireless network and wireless devices may employ radio access network (RAN) functions for an aerial communication service (e.g., UAS, UAV, unmanned aerial service). Base stations and wireless devices may support radio access network (RAN) functions for an aerial communication service (e.g., UAS, UAV). The RAN functions for the aerial communication service may be an aerial user equipment (UE) communication. In an example, the aerial communication service may be an aerial user equipment (UE) communication. The aerial communication service may support the UAS. The RAN functions for the aerial communication service may comprise a height-based measurement reporting, an interference detection for the aerial UE communication, an interference mitigation for the aerial UE communication, a flight path information reporting, a location reporting for the aerial UE communication, and/or the like.

In an example, the base station may send an RRC message (e.g., RRC configuration message, RRC reconfiguration message) to a wireless device. The RRC message may comprise one or more measurement events regarding the height-based measurement reporting. The one or more measurement event may indicate to the wireless device, a height threshold for the height-based measurement reporting. The wireless device may receive the measurement event comprising the height threshold. The wireless device may send a height report if an altitude of the wireless device is above or below the height threshold. The height report may comprise height of the wireless device, a location of the wireless device, and/or the like.

If received signaling power (e.g., RSRP) of multiple neighboring cells are above certain levels for a wireless device, the wireless device may experience or introduce interference. For interference detection, the base station may configure radio resource management (RRM) event that triggers measurement report when individual (per cell) RSRP values for a configured number of cells (e.g., 8, 16) fulfill the configured event. The configured event may be for the interference detection. The RRM event may be A3, A4 or A5. The wireless device may send a measurement report in response to determine that the RRM event occurs.

In an example, for the interference mitigation, the base station may configure with a wireless device specific alpha parameter for physical uplink shared channel (PUSCH) power control. The base station may send a radio resource control (RRC) message comprising the alpha parameter for the PUSCH power control. If a wireless device receives the dedicated alpha parameter (e.g., alpha-UE) from the base station, the wireless may apply the dedicated alpha parameter instead of a common alpha parameter.

In an example, a base station may request to a wireless device to report flight path information by sending a user equipment information request message. The flight path information may comprise a number of waypoints defined as 3D locations. The user equipment information message may indicate a maximum number of waypoints and/or whether timestamps are required for the waypoints. The wireless device may receive the user equipment information message. If the wireless device is available to report the flight path, the wireless device may send a user equipment information response message to the base station. The user equipment response message may comprise one or more waypoints and one or more timestamps associated with the one or more waypoints. The base station may use the flight path information for congestion prediction or resource handling to mitigate interference.

In an example, for the location reporting for the aerial UE communication, the base station may request to a wireless device to include a horizontal and vertical speed of the wireless device for location information reporting. The wireless device may send location information reporting to the base station. The location information reporting may comprise the horizontal speed, the vertical speed, and/or the like. The location information may further comprise height of the wireless device.

Remote identification (RID) may be a technology to avoid collision between different UAVs or between manned aircrafts and UAVs. To prevent collision accidents, a federal aviation authority (FAA) may integrate the UAVs into a national airspace system (NAS) by introducing the RID. The RID may be an ability of a UAS in flight to provide identification and tracking information that may be received by other parties and may play a role in identifying and grounding unauthorized UAS in restricted areas. In an example, UAVs above 0.55 lbs. may be mandated to support RID. There may be two types of RID: standard RID and limited RID. For standard RID, a UAV may support a network publishing identification (ID) and a direct broadcast ID. For limited RID, the UAV may support the network publishing ID. For limited RID, the UAV may not support the direct broadcast ID. The network publishing ID may be based on communication via an internet from a RID server provider that interfaces with the UAV. The direct broadcast ID may be based on direct transmission of the RID by a UAV using its onboard direct transmission technology (e.g., Bluetooth, Wi-Fi module). A UAV that supports the limited RID (e.g., does not support the direct broadcast ID) may not be allowed to fly above 400 feet. For a UAV that supports the limited RID, network connectivity may be required during the flight. A UAS that supports the standard RID may be allowed to fly above 400 feet and there is no restriction for the network connectivity.

In an example, command and control communication may be a user plane link to deliver message with information of command and control for UAV operation from a UAV controller or a UTM to the UAV. The command and control communication may be C2 communication. The C2 communication comprises three types of communication 1) direct C2 communication, 2) network assisted C2 communication, 3) UTM navigated C2 communication. The direct C2 communication may use the direct communication link between a UAV and a UAV controller. The network assisted C2 communication may use cellular network (e.g., public land mobile network) for a communication between the UAV and the UAV controller. For the UTM navigated C2 communication may use, the UTM may provide a pre-scheduled flight plan to the UAV and the UTM may keep track and verify up to date restrictions or flight plan to the UAV.

FIG. 18 shows an example interfaces (e.g., U2U, UAV3, UAV6, UAV8, UAV9) for the unmanned aerial system with wireless network (e.g., PLMN1, PLMN2). The interface may be a communication connectivity. In an example, U2U interface may be an interface for the direct broadcast ID. UAV8 interface may be an interface for the direct C2 communication between the UAV and the UAV controller. The UAV3 interface may be an interface between the UAV and the UAV controller via wireless network. In an example, the UAV3 may be in intra-PLMN or inter-PLMN. In an example, for the intra-PLMN, the PLMN1 and PLMN2 may be same PLMN. For the inter-PLMN, the PLMN1 and the PLMN2 may be different PLMN. In an example, the UAV9 may be interface between the UAV and a networked UAV controller and the USS/UTM for UAS management (e.g., authentication and authorization, transporting C2, RID and tracking information of the UAV). In an example, the UAV6 may be interface between the PLMN (e.g., 3GPP network) and a USS/UTM for functionality exposure, support of identification and tracking, and a UAV authentication/authorization.

FIG. 19 illustrates an example registration procedure regarding an authentication and authorization (AA) for a UAS service between a wireless device (e.g., UE), a base station (e.g., NR-RAN, gNB), a mobility management function (e.g., AMF), a session management function (e.g., SMF), a subscription server (e.g., UDM), a UAS network function (NF) and a traffic manager (e.g., UTM, USS). The traffic manager may be an AA server. In an example, the wireless device may access 5G system via a base station (e.g., gNB). The mobility management function may be an access and mobility management function (AMF). The subscription server may be a unified data management (UDM).

In an example, the wireless device may send a registration request message to the AMF via the base station. The registration request message may comprise an identity of the wireless device, a UAS service capability, slice information, a civil aviation authority (CAA) UAV identifier, and/or the like. In an example, the UAS service capability may be whether the wireless device supports the RAN functions for an aerial communication service (e.g., UAS service). In an example, the capability of the UAS service may be whether the wireless device requires the UAS service (e.g., acting as a UAV or UAV controller). An aviation domain or functions of the aviation domain may assign the CAA UAV identifier to the wireless device. The CAA UAV identifier may be a CAA-level UAV identifier. In an example, the aviation domain may be a UAS traffic management (UTM) or a UAS service supplier (USS). The CAA UAV identifier may be a CAA UAV identifier. The CAA UAV identifier may be used for the RID and tracking of the wireless device. The identity of the wireless device may comprise at least one of a SUCI, 5G-GUTI, an international mobile equipment identity (IMEI), an IMEI software version (IMEISV), a shortened version of 5G-GUTI, and/or the like.

In response to receiving the registration request message, the AMF may send a UE context request message to a UDM (e.g., subscription server). The UE context request message may comprise an identifier of the wireless device, the capability of the UAS, slice information, the CAA UAV identifier, and/or the like. In an example, the identity of the wireless device may be a subscriber permanent identifier (e.g., IMSI, SUPI) of the wireless device.

In an example, the UDM may receive the UE context request message from the AMF. In response to receiving the UE context request message, the UDM may send a UE context response message comprising subscription information of the wireless device to the AMF. The UDM may determine the subscription information based on an existence of the capability of the UAS service or the CAA UAV identifier and slice information. In an example, if the capability of the UAS service is present in the UE context request message, the UDM may include unmanned aerial service subscription information to the subscription information. In an example, if the CAA UAV identifier is present in the UE context request message, the UDM may include unmanned aerial service subscription information to the subscription information. The subscription information may be subscription data. In an example, the subscription information may indicate whether the wireless device is allowed to get the UAS service. In an example, the subscription information may indicate whether the wireless device is allowed to get the UAS service or not. The subscription information may further indicate whether an authentication and/or authorization is required for the UAS service.

The AMF may receive the UE context response message comprising the subscription information. In response to receiving the UE context response message, the AMF may determine whether an authentication and/or authorization for the UAS service is required. The determination may be based on the capability provided by the wireless device, the CAA UAV identifier, subscription information provided by the subscription server, and/or the like. If the capability indicates that the wireless device does not support the UAS service, the AMF may not allow the UAS service and may not perform the authentication and/or authorization for the service.

In an example, the subscription information may indicate that the wireless device is allowed to get the UAS service. If the UAS service is allowed for the wireless device, the AMF may check whether the wireless device is required the authentication and/or authorization. If the authentication and/or authorization is required for the service, the AMF may indicate to the wireless device that the authentication and/or authorization for the UAS service is pending. During the authentication and/or authorization for the UAS service of the wireless device is pending, the AMF may withhold the RAN function activation associated with the service with the base station and the wireless device.

If the authentication and/or authorization for the UAS service is required based on the subscription information, the AMF may perform the authentication and/or authorization procedure for the UAS service by sending an authentication and/or authorization (AA) request message to an authentication and/or authorization (AA) server. The AMF may send the AA request message to the AA server via an UAS network function (NF). The AA server may be the UTM or the USS. The AMF may send the AA request message to the AA server via a NEF or new network device (e.g., UAS network function) for the UAS service. The AA request message may comprise the CAA UAV identity, a GPSI, and/or the like. The AA server may use the CAA UAV identity to identify the wireless device inside the AA server or the aviation domain (e.g., UTM/USS). The 3GPP network (e.g., cellular operator) may assign the GPSI for the UAS service. The AA server may use the GPSI for communication with the 3GPP network.

The AA request message may trigger performing the authentication and/or authorization procedure between the AA server and the wireless device. The detailed procedure for the service specific AA procedure is described in FIG. 20 . If the service specific AA procedure is completed, the AA server may send an authentication and/or authorization (AA) response message to the AMF. The AA response message may comprise an authorization result, an authorized type, an authorized level, authorized paths, and/or the like. In an example, the AA completion may mean the use of service in application layer between the wireless device and the AA server is ready.

In an example, the AMF may receive an AA response message from the AA server. In response to receiving the AA response message, the AMF may send a configuration update message indicating the authorization result (e.g., whether the wireless device is authenticated and authorized for the UAS service). If the authorization result indicates that the UAS service is not authenticated/authorized for the wireless device (e.g., the authentication/authorization is failed), the wireless device may not request an establishment of one or more PDU sessions associated with the UAS service. If the authorization result indicates that the UAS service is authenticated/authorized for the wireless device (e.g., the authentication/authorization is succeeded), the wireless device may request an establishment of one or more PDU sessions associated with the UAS service to a SMF. In an example, the AAA-S may be the AA server.

In an example implementation, the AMF may not perform the AA procedure for the UAS. The SMF may perform the AA procedure for the UAS service by sending AA request message to an AA server. If the SMF performs the AA procedure, the AA procedure may be part of the PDU session establishment procedure.

FIG. 20 illustrates an example service specific authentication and authorization procedure. An access and mobility management function (AMF) may trigger the start of the service specific authentication and authorization procedure for a service. The AMF may be a mobility management entity (MME). The AMF may send an extensible authentication protocol (EAP) Identity Request for the service in a NAS MM Transport message including the service name to a wireless device. The wireless device may provide the EAP Identity Response for the service alongside the service name in an NAS MM Transport message towards the AMF. The AMF may send the EAP Identity Response to an authentication and authorization (AA) server in an authentication request (EAP Identity Response, AAA-S address, GPSI, a service name) message. If the AAA-P is present (e.g., because the AAA-S belongs to a third party and the operator deploys a proxy towards third parties), the AA server forwards the EAP ID Response message to the AAA-P. Otherwise, the AA server forwards the message directly to the AAA-S. The AA server may use towards the AAA-P or the AAA-S a AAA protocol message of the same protocol supported by the AAA-S. The AAA-P may forward the EAP Identity message to the AAA-S addressable by the AAA-S address together with the service and GPSI. The AAA-S may store the GPSI to create an association with the EAP Identity in the EAP ID response message, so the AAA-S may later use the GPSI to revoke authorization or to trigger reauthentication. EAP-messages may be exchanged with the wireless device. One or more iterations of these steps may occur. If EAP authentication completes, the AAA-S may store the service for which the authorization has been granted, so the AAA-S may decide to trigger reauthentication and reauthorization based on its local policies. An EAP-Success/Failure message may be delivered to the AAA-P (or if the AAA-P is not present, directly to the AA server) with GPSI and the service name. If the AAA-P is used, the AAA-P may send a AAA Protocol message including (EAP-Success/Failure, the service name, GPSI) to the AA server. The AA server may send the Authenticate Response (EAP-Success/Failure, the service mane, GPSI) to the AMF. The AMF may transmit a NAS MM Transport message (EAP-Success/Failure) to the wireless device. The AMF may store the EAP result for each service for which the service specific authentication and authorization procedure is executed. In an example, the AAA-S may be the AA server.

FIG. 21 illustrates an example scenario in accordance with embodiments of the present disclosure wherein an altitude-based event notification associated with a wireless device is used by third party service providers, regulatory bodies, one or more network nodes, and/or the like. In an example, the regulatory body may be an unmanned aerial system (UAV) traffic management (UTM) or a UAV service supplier (USS). The wireless device may be, for example, an unmanned aerial vehicle (UAV), as illustrated in the figure. A UAV 1 may be authorized by the regulatory body to fly above a threshold 1 (e.g., altitude X). In an example, the UAV 1 may be not allowed to fly under the threshold 1. A UAV 2 may be authorized by the regulatory body to fly under a threshold 2 (e.g., altitude Y). The UAV 2 may be not allowed to fly above the threshold 2. The regulatory body may request that the UAVs notify a communication network if the altitudes of the UAVs are above or below the thresholds. In an example, the UAV 1 may move to below the threshold 1. The communication network may send the altitude-based event notification in response to the altitude of UAV 1 being below the threshold 1. In response to receiving the altitude-based event notification, the regulatory body may revoke an authentication and/or authorization of a flight of the UAV 1. The UAV 2 may move above the threshold 2. The regulatory body may request a communication network, to disconnect one or more session service with the UAV 2.

In an example, an altitude may comprise a height, elevation, and/or vertical distance. The altitude may have a direction (for example, opposite the direction of gravity). The direction may be orthogonal to horizontal directions (for example, latitudinal and/or longitudinal directions). The altitude may be based on (for example, relative to) one or more reference positions. The altitude may be determined relative to a terrestrial reference altitude (for example, sea level, ground level, atmospheric levels). The altitude may be determined relative to an artificial structure (for example, the top of a building). The altitude may be network-based (for example, the vertical position of a base station, the vertical position of a transmitting and/or receiving element, the vertical extent of a coverage area of a cell and/or beam, etc.).

In an example, a threshold altitude (e.g., one hundred meters above ground level) may separate a first range of altitudes (zero to one hundred meters) from a second range of altitudes (more than one hundred meters). In another example, a third range of altitudes may be separated by a second threshold based on a different reference position (e.g., more than ten thousand meters above sea level). In another example, a first range of altitudes may correspond to a vertical coverage area of a cell, and a second range of altitudes may correspond to vertical distances beyond the coverage area of the cell.

FIG. 22 and FIG. 23 illustrate example height reporting events. In an example, a communication network may provide height reporting based on an event of a wireless device. The event for the height reporting may be “H”. The event for the height reporting may be named “H”.

FIG. 22 illustrates a height reporting event relating to a wireless device exceeding a maximum height (e.g., ceiling). In an example, the event for the height reporting may comprise a first height event (e.g., H1) wherein the wireless device is above a threshold. An entering condition of the first height event may be satisfied if the wireless device height is above the threshold. The communication network may provide the threshold to the wireless device via a dedicated message (e.g., RRC message, NAS message) or a broadcast message (e.g., system information). The communication network may further provide a hysteresis value for the first height event. The threshold may comprise a first threshold and an offset value for the first threshold. The threshold may be a sum of the first threshold and the offset value. At 2210, the wireless device may move up and cross above the threshold. In an example, the hysteresis value is not provided or ‘zero’. The wireless device may determine that the entering condition is satisfied (e.g., fulfilled) if the height of the wireless device is equal to or greater than the threshold. In an example, the hysteresis value is provided and not ‘zero’. The wireless device may determine that the entering condition of the first height event is satisfied if the height of the wireless device is equal or greater to a sum of the threshold and the hysteresis value. The hysteresis value may be used to avoid frequent height reporting (e.g., over-frequent height reporting). For example, if there is no hysteresis value (or if the hysteresis value is set to zero), then a wireless device traveling near the threshold height may report an excessive number of height events. The hysteresis value may help the wireless device ensure that the entering condition is satisfied. At 2220, the wireless device may move down and cross under the threshold. The wireless device may determine that the leaving condition (e.g., H1−2) of the first height event is satisfied (e.g., fulfilled) if the height of the wireless device is equal or lesser (e.g., lower, shorter) to the threshold. In an example, the hysteresis value is provided and not ‘zero’. The wireless device may determine that the leaving condition of the first height event is satisfied if the height of the wireless device is equal or lesser to the threshold minus the hysteresis value.

FIG. 23 illustrates a height reporting event relating to a wireless device falling below a minimum height (e.g., floor). In an example, the event for the height reporting may comprise a second height event (e.g., H2). The entering condition of the second height event may be satisfied if the wireless device height (e.g., altitude) is below the threshold. The communication network may provide the threshold to the wireless device via a dedicated message (e.g., RRC message, NAS message) or a broadcast message (e.g., system information). The communication network may further provide a hysteresis value for the first height event. The threshold may be comprise a first threshold and an offset value for the first threshold. The threshold may be a sum of the first threshold and the offset value. At 2310, the wireless device may move down and cross below the threshold. In an example, the hysteresis value is not provided or ‘zero’. The wireless device may determine that the entering condition of the second height event (e.g., H2−1) is satisfied (e.g., fulfilled) if the height of the wireless device is equal or lesser (e.g., lower, shorter) to the threshold. In an example, the hysteresis value is provided and not ‘zero’. The wireless device may determine that the entering condition of the second height event (e.g., H2−1) is satisfied if the height of the wireless device is equal or lesser to the threshold minus the hysteresis value. The hysteresis value may be used to avoid frequent height reporting. The hysteresis value may help the wireless device ensuring the entering condition being satisfied. At 2320, the wireless device may move up and cross above the threshold. The wireless device may determine that the leaving condition of the second height event (e.g., H2−2) is satisfied (e.g., fulfilled) if the height of the wireless device is equal or greater to the threshold. In an example, the hysteresis value is provided and not ‘zero’. The wireless device may determine that the leaving condition of the second height event is satisfied if the height of the wireless device being equal or greater to a sum the threshold and the hysteresis value.

In existing technologies, a base station may request, from a wireless device in an RRC connected state, height reporting based on an event (e.g., a report of a measurement event for height) of the wireless device. The wireless device may perform the measuring and/or reporting height (and/or changes in height) for as long as it remains in the RRC connected state. The wireless device may to provide measurements after transitioning out of the RRC connected state (for example, after a period of inactivity). In certain use cases (e.g., aerial systems), the limited information provided in existing reports (particularly, for wireless devices in a non-connected state) can cause the problem of inaccurate mapping of signal strength distribution in a geographical area. For example, existing wireless devices may provide signal strength measurements and/or location data (e.g., 2-dimensional x/y, latitude/longitude data). However, a change of height of the wireless device (e.g., aerial vehicle) may affect the signal strength, even if location (e.g., 2d location) is held constant. For example, even at one specific location, a signal strength report may vary significantly based on the height at which the measurement was performed. This can prevent accurate determination, by the network, of signal strength distribution (i.e., coverage areas of base stations).

This can also cause the problem of non-compliance with regulatory requirements, which may require that the wireless device (e.g., aerial vehicle) observe certain upper or lower height limits. For example, the wireless device may be an unmanned aerial vehicle (UAV) or an aerial user equipment (UE). The wireless device may communicate with an unmanned aerial system (UAS) server to get a flight authorization or control information. The wireless device may communicate with an unmanned aerial system (UAS) server to report flight assisting information (e.g., photos, sensing data). The UAS server (e.g., UAS application server, UAS traffic management (UTM), UAS service supplier) may request height of the wireless device or a change of the height of the wireless device during the wireless device in flight. In an example, the UAS server may in charge of a regulation for the UAS. Based on the regulation, the wireless device may be authorized to fly above a specific altitude. Based on the regulation, the wireless device may be authorized to fly below a specific altitude. The specific altitude may be a threshold. The UAS server may request to notify whether the height of wireless device is above the threshold or below the threshold. The UAS server may request to get the notification even if there is no active communication with the wireless device (e.g., even if the wireless device is not in an RRC connected state). The report of the measurement event of the existing technologies may not be sufficient to support the regulation requirement. The report accuracy may not be enough to govern the wireless device based on the regulation. Therefore, enhanced measurement report for the height is required.

In accordance with example embodiments of the present disclosure, a wireless device not in an RRC connected state (e.g., in an RRC idle state or an RRC inactive state) may determine a change of height of the wireless device. The wireless device may be, for example, an unmanned and/or uncrewed aerial vehicle (UAV). The wireless device may, for example, be subject to regulatory requirements relating to aerial systems. The wireless device may transmit, to a base station, a message indicating a change of height of the wireless device, wherein the change of height was determined while the wireless device was not in the RRC connected state. The indication of the change of height may be provided in addition to other data, for example, reports of signal strength measurements (RSRP, RSRQ) and/or location of the wireless device (e.g., 2d location not in a height direction). The indication of the change of height may facilitate compliance with regulatory requirements relating to aerial systems —requirements which would govern the behavior of the wireless device regardless of the wireless devices operating state (RRC connected state, RRC inactive state, RRC idle state, etc.). The indication of the change of height may further facilitate determination, by the network, of a coverage area of one or more base stations in the network. For example, the indication of the change of height may be combined with signal strength and 2d location data to calculate a detailed signal strength distribution that does not assume a two-dimensional coverage area. For example, the network may support determination and/or approximation of a signal strength distribution in a three-dimensional area (i.e., taking height into account).

In an example, a communication network may indicate to a wireless device, measurement events information requesting to report to the communication network. The measurement events may comprise height reporting, strength reporting based on a threshold. In an example, the strength reporting may be associated with a serving cell or neighbor cells. The communication network may further indicate to the wireless device (e.g., by transmitting a parameter) whether the reporting is required for a wireless device is in a non-connected state (e.g., RRC inactive state, RRC idle state). If the communication network does not indicate that the reporting is required for the wireless device is in the non-connected state, the wireless device may perform the measurement events if the wireless device is in a connected state (e.g., connected mode). If the communication network indicates the reporting is required for the wireless device is in the non-connected state, the wireless device evaluates whether the measurement events are satisfied or not while the wireless device is in the non-connected state. In response to the measurement events being satisfied, the wireless device in the non-connected state may send a message to indicate the measurement events being satisfied. Example embodiment may increase the report accuracy by letting the wireless device send the event status (e.g., whether the measurement events being satisfied) in the non-connected state.

In accordance with example embodiments of the present disclosure, a wireless device may determine to send the event status in response to the measurement events being satisfied. The wireless device may be in a non-connected state (e.g., RRC inactive state). The wireless device may send a message (e.g., RRC resume request message) to a base station of the communication network. The message may comprise an establishment cause (e.g., resume cause) indicating a measurement report. The message may comprise the event status. In response to receiving the message, the base station may reply to the wireless device by sending an RRC release message and may not transit the wireless device to the connected state. Example embodiment may decrease power consumption of the wireless device by letting the wireless device stay in the non-connected state.

In accordance with example embodiments of the present disclosure, a wireless device may determine to send the event status in response to the measurement events being satisfied. The wireless device may be in a non-connected state (e.g., RRC inactive state). The wireless device may send a message (e.g., RRC resume request message) to a base station of the communication network. The message may comprise an establishment cause (e.g., resume cause) indicating a measurement report. The base station may not be a serving base station (e.g., anchor base station) of the wireless device. The base station may determine to not perform a relocation procedure (e.g., moves contexts of the wireless device from the first base station to the second base station) of the wireless device based on the establishment cause being the measurement report. The base station may send to a serving base station of the wireless device, a message comprising the event status of the wireless device. Example embodiment may decrease a signaling overhand for the relocation of the wireless device if the wireless device sends the event status rather than user data.

In accordance with example embodiments of the present disclosure, a base station may send (e.g., transmit) a first threshold for an altitude limit to restrict height of fly for one or more wireless devices in a communication area of the base station. The base station may send the first threshold via broadcast channel so the wireless device may receive the threshold for the altitude limit without a connection establishment with the base station. A second base station may not send the first threshold for the altitude limit. A third base station may send a second threshold which is different from the first threshold. Example embodiment may allow a regulatory body enforcing the altitude limit to the one or more wireless device without connection establishment between the wireless device and the one or more base stations (e.g., first base station, second base station, third base station).

FIG. 24 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure. In an example, a base station (BS) may determine to configure a measurement event for height reporting (e.g., height) of a wireless device that is not in a connected state (e.g., non-connected mode, idle state, inactive state, etc.). The base station may configure the measurement event by sending a first message to the wireless device. The first message may be a first radio resource control (RRC) message between the wireless device and the base station. The base station may be a gNB, eNB, AN, and/or the like. The first message may comprise a message type, a threshold, an event type, a hysteresis value, a transaction identity of the first message, a first parameter indicating that the measurement event applies for a wireless device in the non-connected state, and/or the like. The threshold, the hysteresis value and the event type may be for the height reporting. The first message may be a measurement report configuration message. The first message may be an RRC reconfiguration message. The wireless device may be in a connected state (e.g., connected mode) when the wireless device receives the first message. The event type may indicate the entering condition of the event. The event type may comprise a first height event, a second height event, a third height, and/or the like. The first height event may be the event type that a wireless device height becomes higher than the threshold as explained in FIG. 22 . The second height event may be the event type that a wireless device height becomes lower than the threshold as explained in FIG. 23 . The third height event may be the event type that the wireless device immediately reports height of the wireless device. The threshold and the hysteresis value may be explained in FIG. 22 , FIG. 23 . In an example, the message type may indicate an RRC connection reconfiguration. The transaction identity (e.g., 0-15) and the message type of the first message may identify an RRC procedure (e.g., RRC reconfiguration procedure) between the wireless device and the base station. The connected state may be an RRC connected state. The non-connected state may be an RRC inactive state. The non-connected state may be an RRC idle state.

In an example, the base station may detect inactivity of the wireless device (e.g., no uplink or downlink data transmission with the wireless device for a time duration), the base station may send a second message indicating a release of the wireless device. The second message may be an RRC release message. The second message may request the wireless device transition into the non-connected state.

In an example, the wireless device in the non-connected state may move up the threshold as illustration at 2210. The wireless device in the non-connected state may move down the threshold as illustration at 2310. The wireless in the non-connected state may determine a change of height of the wireless device based on the threshold. The wireless device in a non-connected state may perform measurement for the measurement event. The wireless device in the non-connected state may determine that the measurement event (e.g., the first height event, the second height event) for height reporting is satisfied (e.g., fulfilled) based on the height of the wireless device and the first message. The determination may be based on the first parameter. The determination may be available in response to the first message indicating that the measurement event applies for the wireless device in the non-connected state. If the first message does not indicate that the measurement event applies for the wireless device in the non-connected state (e.g., does not comprise the first parameter), the wireless device may not perform measurement associated with the height reporting. The wireless device may not determine the measurement event for height reporting being satisfied if the wireless device does not perform the measurement.

Based on the determination, the wireless device may send a third message indicating the determination (e.g., the event type which has been satisfied/fulfilled the entering condition). The third message may indicate the first height event or the second height event. The third message may be a third RRC message. The third RRC message may comprise the event type. The third RRC message may indicate the first height event or the second height event or both. The wireless device may send the third message based on the first parameter. The wireless device may be the non-connected state. Based on the determination, the wireless device may perform random access channel (RACH) procedure to transition into connected state. Based on the determination, the wireless device may perform random access channel (RACH) procedure to send the third message. The third message may be an RRC resume request message. The third message may be an RRC connection request message. The third message may be a measurement report message. The third message may further comprise location information of the wireless device, a horizontal velocity of the wireless device, a vertical velocity of the wireless device and/or the like. The location information may comprise an ellipsoid point of the wireless device. The ellipsoid point of the wireless device may comprise a latitude, a longitude, a height (e.g., an altitude) and/or the like. The third message may comprise a cause parameter indicating the measurement reporting, a wireless device identity, and/or the like. The wireless device identity may comprise an initial user equipment (UE) identity, a resume identity, and/or the like. In an example, the initial UE identity may comprise a temporary mobile subscriber identity (TMSI). The initial UE identity may comprise partial of the TMSI (e.g., S-TMSI). The resume identity may comprise a radio network temporary identifier (RNTI) (e.g., shortI-RNTI).

In an example, the base station may receive from a mobility management function, a location report control message for the wireless device, to request notify a height status of the wireless device based on the threshold. The mobility management function may be an access and mobility management function (AMF). The mobility management function may be a mobility management entity (MME). The location report control message may comprise the threshold, an accurate level of the report, report type, a UE identity, and/or the like. In an example, the UE identity may comprise an AMF user equipment (UE) next generation (NG) application protocol (NGAP) ID, RAN UE NGAP ID, and/or the like. The AMF NGAP ID and the RAN UE NGAP ID may be used to identify the wireless device over the next generation (NG) interface (e.g., N2 interface, between the base station and the AMF). In an example, the location report control message may indicate whether the height status based on the threshold is required for a wireless device is in non-connected state. The accurate level of the report may indicate whether the height status based on the threshold is required for a wireless device is in non-connected state. If the accurate level indicates a higher accuracy, the base station may determine that the height status based on the threshold is required for a wireless device in the non-connected state. The report type may indicate whether the height status based on the threshold is required for a wireless device is in the non-connected state.

In response to receiving the location report control message, the base station may send the first message. The first parameter may be based on the location report control message. If the location report control message indicates that the height status based on the threshold is required for a wireless device is in non-connected state, the base station indicate to the wireless device as it so (e.g., the measurement event applies for a wireless device in the non-connected state). If the location report control message indicates that the height status based on the threshold is required for a wireless device is in non-connected state, the base station may send the first message comprising the first parameter.

In response to receiving the third message, the base station may send a location report to the mobility management function indicating the height status based on the threshold. The height status may indicate above (e.g., H1, H1−1), below (e.g., H2, H2−1), and/or the like.

FIG. 25 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure. Procedures of the FIG. 25 may be similar to the procedures of the FIG. 24 , except for some differences explained below.

In FIG. 25 , the first message may be omitted. At 2510, the second message may comprise the message type, the threshold, the event type, the hysteresis value, a transaction identity of the second message, and/or the like. In response to receiving the second message, the wireless device may transition into the non-connected state. The second message may be the RRC release message. (e.g., RRC connection release message). In response to receiving information for the height reporting (e.g., the threshold, the event type for the height reporting) in the second message, the wireless device may determine to perform the measurement for the measurement event. If the wireless device receives the RRC release message comprising the information for the height reporting, the wireless device determines that the measurement event (e.g., height reporting) applies for the wireless device in the non-connected state.

FIG. 26 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure. Procedures of the FIG. 26 may be identical with the procedure of the FIG. 24 , except for some differences explained below.

At 2610, in response to determining that the measurement event for height reporting is satisfied, the wireless device may perform the RACH procedure by sending a preamble message. At 2620, if the wireless device receives a grant message for the preamble message, the wireless device may send the third message comprising the event type of the measurement event (e.g., the first height event, the second height event). The third message may be an RRC resume request message. The third message may comprise an establishment cause, the event type, and/or the like. The third message may indicate whether the satisfied event is the first height event or the second height event. The establishment cause may be a resume cause. In response to receiving the third message (e.g., the RRC resume request message) comprising the event type and the establishment cause, at 2630, the base station may send a fourth message to the wireless device, to request keeping the wireless device is in the non-connected state. The wireless device may stay in the non-connected state (e.g., the RRC inactive) while the wireless device sends the event type which has been satisfied the entering condition. Example embodiment may decrease power consumption of the wireless device by staying the wireless device in the non-connected state.

In an example implementation, the wireless device may receive the first message and the second message from a first base station. In an example, the wireless device may determine the measurement event being satisfied after the wireless device moves into a second base station. The wireless device may send the third message to the second base station. In response to receiving the third message, the second base station may not perform a relocation procedure (e.g., moves contexts of the wireless device from the first base station to the second base station) of the wireless device if the cause value indicates the measurement report. The second base station may not perform the relocation procedure of the wireless device if the cause value indicates that the measurement report and the third message comprise the event type. The second base station may send to the first base station, a measurement report message of the wireless device comprising the event type. The measurement report message may comprise a UE identity (e.g., RNTI). In response to receiving the measurement report message, the first base station may send the location report to the mobility management entity (e.g., AMF, MME).

FIG. 27 illustrates an example height reporting procedure in accordance with embodiments of the present disclosure. Procedures of the FIG. 27 may be identical with the procedure of the FIG. 24 , except for some differences explained below.

At 2710, the wireless device may send a third message to the base station, to request a connection setup or resumption. The third message may be an RRC resume request message. The third message may be an RRC setup request message. The third message may comprise an establishment cause indicating a mobile originated signaling. At 2720, in response to receiving the third message, the base station may send a fourth message to the wireless device, to request to transition into the connected state (e.g., RRC connected state). The fourth message may be the RRC setup request message. The fourth message may be the RRC resume request message. In response to receiving the fourth message, the wireless device may transition into the connected state. In response to receiving the fourth message, the wireless device may send a fifth message to the base station comprising the event type of the height reporting. The fifth message may further comprise location information of the wireless device, a horizontal velocity of the wireless device, a vertical velocity of the wireless device and/or the like. At 2740, the wireless device may receive from the UPF via the base station, a user packet comprising an application message. The application message may indicate a revocation of an authentication and authorization (AA) for the wireless device. The wireless device may indicate to an upper layer (e.g., UAS layer, UAS application layer) that the AA revoked. In an example, the wireless device may stop to fly based on the AA revocation. The application message may be based on the measurement event. The measurement event (e.g., the event type which has been satisfied) may be send to an UAS server via the AMF. The UAS service may decide to stop the flight of the wireless device in response to the wireless device crossing the threshold. Example embodiment may allow that the wireless device receives the application message after sending the location report to the AMF. The example embodiment may decrease a transition of the wireless device (e.g., from non-connected to connected state, vice versa) if downlink data is expected following the location report for the height status.

In an example, regulation (e.g., regulatory compliance, UTM, USS) may limit/restrict that one or more wireless devices fly above an altitude threshold or below an altitude threshold. As illustrated in FIG. 28 , if a wireless device is a communication area of a first base station (BS), the wireless device may receive system information from the first BS via a broadcast channel. The system information may comprise an altitude X and may indicate whether the altitude X is an upper limit or a lower limit. If the altitude X is the upper limit, the wireless device may not be allowed to go above the altitude X. If the altitude Y is the lower limit, the wireless device may not be allowed to go below the altitude X. The wireless device may move to a communication area of a second BS. If the wireless device is a communication area of the second BS, the wireless device may receive system information from the second BS via a broadcast channel. The system information may comprise an altitude Y and may indicate whether the altitude Y is an upper limit or a lower limit. In an example, the altitude X and Y may be different value. In an example, there may be a third BS. The third BS may not broadcast the altitude X or the altitude Y.

FIG. 29 illustrates an example height reporting procedure based on a scenario described in FIG. 28 . A wireless device may receive from a base station (BS), first system information indicating a threshold (e.g., altitude X) for an altitude limit (e.g., upper limit, lower limit). The wireless device may determine to fly above or below the threshold while the wireless device is in a communication area of the first BS. The wireless device may receive the first system information from the base station via a cell. The wireless device may determine to fly above or below the threshold while the wireless camps on the first BS via the cell. The wireless device may inform (e.g., indicate) to an UAS application layer of the wireless the determination. Later, the wireless device may determine that a first height event (e.g., H1) or a second height event (e.g., H2) is satisfied based on the altitude X for the altitude limit. In response to the determination, the wireless device may send a message to the base station. The message may be an RRC message. The message may indicate an event type. The event type may indicate the first height event or the second height event. The first height event may be an event type that the wireless device height becomes higher than the threshold as explained in FIG. 22 . The second height event may be the event type that a wireless device height becomes lower than the threshold as explained in FIG. 23 .

In an example, the wireless device moves to a communication area of a second BS. The wireless device may receive from the second BS, second system information. The second system information may not indicate a threshold for an altitude limit. In response to receiving the second altitude limit, the wireless device may determine that the wireless device can fly without altitude limitation/restriction. The wireless device may inform (e.g., indicate) to an UAS application layer of the wireless the determination.

In an example, the wireless device moves to a communication area of a third BS. The wireless device may receive from the third BS, third system information indicating a second threshold (e.g., altitude X) for an altitude limit (e.g., upper limit, lower limit). The wireless device may determine to fly above or below the second threshold while the wireless device is in a communication area of the third BS. The wireless device may determine to fly above or below the second threshold while the wireless camps on the third BS. The wireless device may inform (e.g., indicate) to the UAS application layer of the wireless the determination.

FIG. 30 is an example flow chart as part of the example embodiments. In an example, a wireless device may receive height threshold information comprising the altitude threshold for an altitude limit. The wireless device may receive system information via a broadcast channel. The system information may comprise the height threshold information. The wireless device may determine that the wireless device is excluded from applying the height threshold information. In an example, the wireless device may be a public safety wireless device or high priority wireless device. The wireless device may be excluded from applying the height threshold information. If the wireless device is a commercial wireless device and is not configured with the high priority. The wireless device may not be excluded from applying the height threshold information. If the wireless device is not excluded from applying the height threshold information, the wireless device may inform the height threshold information to upper layer of the wireless device (e.g., UAS application layer). If the wireless device is excluded from applying the height threshold information, the wireless device may not inform the height threshold information to upper layer of the wireless device.

FIG. 31 is an example flow charts as part of the example embodiments. In an example, a base station may determine whether a height reporting (e.g., height status reporting) is required for a wireless device is in a non-connected state. If the base station determine that the height reporting is required for the wireless device in the non-connected state, the base station may provide height threshold information and additionally indicate that the height threshold information is applicable for the non-connected state. If the base station determine that the height reporting is not required for the wireless device in the non-connected state, the base station may provide height threshold information and does not indicate that the height threshold information is applicable for the non-connected state.

In an example, a wireless device in an RRC inactive or an RRC idle state, may determine a change of height of the wireless device based on a threshold. Based on the determining, the wireless device may send a first RRC message to indicate the change of height.

In an example, a wireless device, in a non-connected state, may determine that a measurement event for height of the wireless device based on a threshold is fulfilled. Based on the determination, the wireless device may send a first radio resource control (RRC) message to indicate the determination. The non-connected state may be an RRC inactive state. The first RRC message may be an RRC resume request message.

In an example, the wireless device may receive from a base station, a second RRC message. The second RRC message may comprise a transaction identity of the second RRC message, the threshold for the measurement event for height, a hysteresis value for the threshold, an event type, and/or the like. The event type may comprise a first height event that a wireless device height becomes higher than the threshold, a second height event that a wireless device height becomes lower than the threshold. And/or the like.

The first RRC message may comprise a cause parameter indicating a measurement report, a user equipment identity, and/or the like.

The first RRC request message may indicate the first height event, the second height event, and/or the like.

The wireless device may receive from the base station, a third RRC message indicating a termination of an RRC connection between the wireless device and the base station. The third RRC message may be an RRC release message. The third RRC message may request the wireless device transitions into the RRC inactive state.

The wireless device may receive from the base station, a third RRC message indicating a resumption of an RRC connection between the wireless device and the base station. The wireless device may send to the base station, a fourth RRC message comprising at least one of: the first height event; the second height event, and/or the like.

The wireless device may be in the non-connected state when the wireless device is sending the first RRC message. The sending may be further based on the second RRC message being an RRC release message.

In an example, the second RRC message may further comprises a parameter indicating that the measurement event applies for a wireless device in the non-connected state. The sending may be further based on the parameter.

The determination may be in response to a height of the wireless device being lower than the threshold. The determination may be in response to a height of the wireless device being higher than the threshold.

The wireless device may be an unmanned aerial vehicle (UAV). The wireless device may be an aerial user equipment (UE).

In an example, the non-connected state may be an RRC idle state. The first RRC message may be an RRC connection request message.

The first RRC message may comprise a cause value indicating a measurement report.

In an example, a base station may determine to configure a measurement event for height of a wireless device in a non-connected state. The base station may send to the wireless device in a radio resource control (RRC) connected state, a first RRC message comprising a threshold value of the measurement event for height, a parameter indicating that the measurement event applies for a wireless device in the non-connected state, and/or the like. The determination may be based on the measurement event for height being required by a core network node. The core network node may be an access and mobility management function (AMF).

The first RRC message may be an RRC release message. The first RRC message may further comprise an identity of the wireless device, a hysteresis value for the threshold, an event type, and/or the like. The event type may comprise a first height event that a wireless device height becomes higher than the threshold, a second height event that a wireless device height becomes lower than the threshold, and/or the like.

The base station may receive from the wireless device, a second RRC message comprising a cause parameter indicating a measurement report, a user equipment identity, the event type. The non-connected state may comprise an RRC inactive stage or an RRC idle state.

The base station may receive from an access and mobility management function (AMF), a next generation application protocol (NGAP) message requesting a location reporting to notify a change in height of a wireless device. The determination may be based on the NGAP message. The NGAP message may comprise the threshold value. The NGAP message may indicate that the threshold value is upper limit or lower limit. The NGAP message may indicate that an accuracy of the location reporting is a high accuracy. The determination may be based on the accuracy of the location reporting.

In an example, a base station may determine to get one or more reports of one or more measurement events for height of a wireless device in a radio resource control (RRC) inactive or an RRC idle state. The base station may send to the wireless device in an RRC connected state, an RRC message. The RRC message may indicate the determination, a threshold value for the one or more measurement events for height.

In an example, a wireless device may receive from a base station via a cell, first system information indicating a threshold for an altitude limit. The wireless device may determine to fly above or below the threshold while the wireless device camps on the cell. The wireless device may indicate to an unmanned aerial system (UAS) application layer of the wireless device, the determination. The wireless device may send to the base station, a message indicating a wireless device height becomes higher than the threshold or a wireless device height becomes lower than the threshold.

The wireless device may receive, from a second base station via a second cell, second system information not indicating a threshold for an altitude limit. The wireless device may indicate to an unmanned aerial system (UAS) application layer of the wireless device, that the wireless device can fly without the altitude limit.

The wireless device may receive from a third base station via a third cell, third system information indicating a second threshold for an altitude limit. In response to receiving the third system information, the wireless device may indicate to an unmanned aerial system (UAS) application layer of the wireless device, that the wireless device can fly above or below the second threshold while the wireless device camps on the third cell. 

What is claimed is:
 1. A method comprising: determining, by a wireless device not in a radio resource control (RRC) connected state, a change of height of the wireless device; and transmitting, by the wireless device to a base station, a message indicating the change of height of the wireless device.
 2. The method of claim 1, further comprising receiving, by the wireless device from the base station, at least one of: a threshold for determining the change of height; a hysteresis value for determining the change of height; an event type associated with the change of height; and a parameter indicating that the threshold, the hysteresis value, and/or the event type is for height measurements by the wireless device while not in the RRC connected state.
 3. The method of claim 2, wherein the threshold, the hysteresis value, the event type, and/or the parameter are received by the wireless device while the wireless device is in the RRC connected state.
 4. The method of claim 2, wherein the event type is one of one or more event types indicating: that the height of the wireless device becomes higher than the threshold; that the height of the wireless device becomes higher than the threshold plus at least a portion of the hysteresis value; that the height of the wireless device becomes lower than the threshold; and/or that the height of the wireless device becomes lower than the threshold minus at least a portion of the hysteresis value.
 5. The method of claim 2, wherein the threshold, the hysteresis value, the event type, and/or the parameter are received in at least one of: a measurement report configuration message; and an RRC reconfiguration message.
 6. The method of claim 2, wherein the threshold, the hysteresis value, the event type, and/or the parameter are received in an RRC release message.
 7. The method of claim 6, further comprising transitioning, by the wireless device based on the RRC release message, out of the RRC connected state.
 8. The method of claim 2, further comprising determining, by the wireless device not in the RRC connected state, the height of the wireless device.
 9. The method of claim 2, further comprising determining, by the wireless device and based on the height of the wireless device, that an event of the event type occurs.
 10. The method of claim 2, further comprising determining, by the wireless device, one or more of: that the height of the wireless device becomes higher than the threshold; that the height of the wireless device becomes higher than the threshold plus at least a portion of the hysteresis value; that the height of the wireless device becomes lower than the threshold; and that the height of the wireless device becomes lower than the threshold minus at least a portion of the hysteresis value.
 11. The method of claim 2, wherein the transmitting the message indicating the change of height of the wireless device is based on the height of the wireless device and/or the height of the wireless device becoming higher and/or lower than: the threshold; and/or the threshold plus or minus at least a portion of the hysteresis value.
 12. The method of claim 2, wherein the message indicating the change of height of the wireless device: indicates the event type; and/or is transmitted based on an occurrence of the event type.
 13. The method of claim 2, wherein the message indicating the change of height of the wireless device comprises at least one of: a cause parameter indicating measurement reporting; and a user equipment identity of the wireless device.
 14. The method of claim 1, wherein the message indicating the change of height of the wireless device indicates a measurement report, or is an RRC setup request message, or both.
 15. The method of claim 1, wherein the wireless device not in the RRC connected state is in an RRC idle state and/or an RRC inactive state.
 16. A wireless device, comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to perform a process, the process comprising: determining, by a wireless device not in a radio resource control (RRC) connected state, a change of height of the wireless device; and transmitting, by the wireless device to a base station, a message indicating the change of height of the wireless device.
 17. A method comprising: transmitting, by a base station to a wireless device, via a cell, system information indicating a threshold for a height of the wireless device; and receiving, by the base station from the wireless device, a message indicating a change of a height of the wireless device, wherein the change is determined by the wireless device not in a radio resource control (RRC) connected state.
 18. The method of claim 17, further comprising transmitting, by the base station to the wireless device in an RRC release message, at least one of: a threshold for determining the change of height; a hysteresis value for determining the change of height; an event type associated with the change of height; and a parameter indicating that the threshold, the hysteresis value, and/or the event type is for height measurements by the wireless device while not in the RRC connected state.
 19. The method of claim 18, further comprising transmitting, by the base station, to the wireless device in the RRC connected state, an RRC release message, wherein the threshold, the hysteresis value, the event type, and/or the parameter are transmitted in the RRC release message.
 20. The method of claim 17, further comprising: receiving, by the base station from a core network node, an indication to notify the core network node of the change of height of the wireless device; and notifying the core network node of the change of height of the wireless device. 